Release CBMC 6.11.0

[tautschnig]

This release adds support for anonymous struct embedding via
-fms-extensions (via #9022), extends the in-tree SMT2 solver with
mathematical and string/regex types and operations (via #9074), and
fixes various front-end and encoding bugs. Docker images are now
published to GitHub Container Registry instead of Docker Hub (via
#9143).

• Each commit message has a non-empty body, explaining why the change was made.
• Methods or procedures I have added are documented, following the guidelines provided in CODING_STANDARD.md.
• The feature or user visible behaviour I have added or modified has been documented in the User Guide in doc/cprover-manual/
• Regression or unit tests are included, or existing tests cover the modified code (in this case I have detailed which ones those are in the commit message).
• My commit message includes data points confirming performance improvements (if claimed).
• My PR is restricted to a single feature or bugfix.
• White-space or formatting changes outside the feature-related changed lines are in commits of their own.

[Copilot]

Pull request overview

Bumps CBMC’s release version metadata to 6.11.0 across the build config and Rust API crate, and adds the 6.11.0 release notes to the top-level changelog.

Changes:

• Update CBMC version in src/config.inc to 6.11.0.
• Update Rust crate version (libcprover_rust) to 6.11.0.
• Add a new CHANGELOG section describing the 6.11.0 release highlights and fixes.

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 1 comment.

File	Description
src/libcprover-rust/Cargo.toml	Bumps Rust API crate version to 6.11.0.
src/config.inc	Bumps CBMC_VERSION to 6.11.0 for build/version metadata.
CHANGELOG	Adds the CBMC 6.11.0 release notes section.

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 80.83%. Comparing base (ce4d052) to head (b2ec777).

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #9157      +/-   ##
===========================================
- Coverage    80.83%   80.83%   -0.01%     
===========================================
  Files         1717     1717              
  Lines       190069   190069              
  Branches        73       73              
===========================================
- Hits        153650   153647       -3     
- Misses       36419    36422       +3     

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