Update pip requirement from <26.1,>=21.0 to >=26.2,<26.3

[dependabot]

Updates the requirements on pip to permit the latest version.

Changelog

Sourced from pip's changelog.

26.2 (2026-07-29)

Deprecations and Removals

• Newly published packages will no longer be immediately visible to pip if the index uses caching. To install a newly published package, use --refresh-package. ([#13680](https://github.com/pypa/pip/issues/13680) <https://github.com/pypa/pip/issues/13680>_)

• Drop support for detecting legacy, non-:pep:405, virtualenv (< 20) environments. ([#14062](https://github.com/pypa/pip/issues/14062) <https://github.com/pypa/pip/issues/14062>_)

• Constraints files, including PIP_CONSTRAINT, no longer affect isolated build environments. Use --build-constraint or the PIP_BUILD_CONSTRAINT environment variable to constrain build dependencies instead.

  The --use-feature=build-constraint flag is now always enabled and has no effect. ([#14094](https://github.com/pypa/pip/issues/14094) <https://github.com/pypa/pip/issues/14094>_)

Features

• Declare support for Python 3.15 ([#14208](https://github.com/pypa/pip/issues/14208) <https://github.com/pypa/pip/issues/14208>_)

• Support self-referential extras officially. pip has supported this by accident since version 21.2. ([#11296](https://github.com/pypa/pip/issues/11296) <https://github.com/pypa/pip/issues/11296>_)

• Add --only-deps flag to instruct pip to select only the dependencies of supplied packages. It cannot be used with --no-deps, -r, --group, or --requirements-from-script. ([#11440](https://github.com/pypa/pip/issues/11440) <https://github.com/pypa/pip/issues/11440>_)

• Cache simple responses in accordance to their Cache-Control header instead of always revalidating on every request. To refresh cached package index responses and ensure newly published packages are found, use --refresh-package <package>. ([#13680](https://github.com/pypa/pip/issues/13680) <https://github.com/pypa/pip/issues/13680>_)

• Add --no-require-hashes to disable automatic enablement of --require-hashes when encountering a requirement with hashes. ([#14169](https://github.com/pypa/pip/issues/14169) <https://github.com/pypa/pip/issues/14169>_)

• Honor --only-final when sourcing requirements with -r pylock.toml. ([#13950](https://github.com/pypa/pip/issues/13950) <https://github.com/pypa/pip/issues/13950>_)

• Add support for pylock.toml upload-time field, so --uploaded-prior-to works with -r pylock.toml. ([#14168](https://github.com/pypa/pip/issues/14168) <https://github.com/pypa/pip/issues/14168>_)

• Better error messages in case of conflicts with requirements from -r pylock.toml. ([#13963](https://github.com/pypa/pip/issues/13963) <https://github.com/pypa/pip/issues/13963>_)

• Add experimental support for isolating build subprocesses by creating standard virtual environments. This will fix most (if not all) subtle isolation issues that can lead to broken builds exclusive to pip. The feature can be enabled via --use-feature=venv-isolation and will be enabled by default in a future release.

  Note that the feature has limited compatibility with --use-feature=inprocess-build-deps. While most builds should work with both features enabled, there are known edge cases. inprocess-build-deps will not be enabled by default until they are fixed. ([#14070](https://github.com/pypa/pip/issues/14070) <https://github.com/pypa/pip/issues/14070>_)

• Present more informative diagnostic errors on uncaught network errors. ([#14115](https://github.com/pypa/pip/issues/14115) <https://github.com/pypa/pip/issues/14115>_)

• Allow opting out of Git partial clones with PIP_NO_PARTIAL_CLONE_FOR_BROKEN_GIT_SERVER. ([#11043](https://github.com/pypa/pip/issues/11043) <https://github.com/pypa/pip/issues/11043>_)

• Add a --no-proxy-env (or --proxy "") option to ignore proxies configured via non-pip environment variables or configuration files. A proxy set with --proxy is still used. ([#5378](https://github.com/pypa/pip/issues/5378) <https://github.com/pypa/pip/issues/5378>_)

• Add support for pulling username from keyring subprocess provider ([#12543](https://github.com/pypa/pip/issues/12543) <https://github.com/pypa/pip/issues/12543>_)

• Speedup tab autocompletion by lazy-importing certain modules. ([#4768](https://github.com/pypa/pip/issues/4768) <https://github.com/pypa/pip/issues/4768>_)

... (truncated)

Commits

• 4b6ae5c Bump for release
• 50b6d3c Update AUTHORS.txt
• dbddfbd Tweak news entries for pip 26.2 (#14212)
• 6576b75 Merge pull request #14165 from sbidoul/refactor-pylock-hanling-sbi
• 0090e00 Address a variety of typos detected in code review
• e12ddd9 Add support for --uploaded-prior-to with -r pylock.toml
• 5eefdbc Better conflict report for requirements from -r pylock.toml
• 6d71ff8 Test --only-final with -r pylock.toml
• e7d6eb9 Refactor -r pylock.toml
• 756506d Add TODO about pylock.select and --no-binary
• Additional commits viewable in compare view

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