Bump soupsieve from 2.8.4 to 2.9.1

[dependabot]

Bumps soupsieve from 2.8.4 to 2.9.1.

Release notes

Sourced from soupsieve's releases.

2.9.1

• FIX: Correct [attr^=""], [attr$=""], and [attr*=""] to match nothing when the value is empty, per CSS Selectors Level 4 substring matching, which previously matched any element merely having the attribute (@​chuenchen309).

2.9

• NEW: Drop Python 3.9 support.
• NEW: Lazy compile selector patterns to improve initial import speed.
• FIX: Correct :nth-child/:nth-of-type (and -last- variants) for An+B values whose sequence steps onto index 0 or onto the last child (e.g. :nth-child(2n-2), :nth-child(n-1), :nth-child(n+5)), which previously matched the wrong elements or nothing at all (@​gaoflow).
• FIX: More efficient CSS ID matching (@​kaimandalic).
• FIX: Fix inefficient trimming of comments and white space (@​kaimandalic).

Commits

• 05e92be Update changelog and bump version
• 9bd73eb Clean up comments and use a (?!) for unmatchable regex
• 8c5ceee Match nothing for empty-value substring attribute selectors (#298)
• 8763f91 Format changelog message
• cf198fc Fix inefficient trimming of comments and white space
• ce44e49 Merge commit from fork
• 751c57b Fix :nth-child/:nth-of-type matching for An+B index boundaries (#297)
• 08e9ede Drop Python 3.9
• d6e6830 Rework selector mapping
• d2d1581 Utilize property for accessing lazy regular expression pattern
• Additional commits viewable in compare view

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