Update soupsieve to 2.8

[pyup-bot]

This PR updates soupsieve from 2.6 to 2.8.

Changelog

2.8

-   **NEW**: Drop support for Python 3.8.
-   **NEW**: Add support for Python 3.14.
-   **NEW**: Deploy with PyPI's "Trusted Publisher".

2.7

-   **NEW**: Add `:open` pseudo selector.
-   **NEW**: Add `:muted` pseudo selector.
-   **NEW**: Recognize the following pseudo selectors: `:autofill`, `:buffering`, `:fullscreen`, `:picture-in-picture`,
 `:popover-open`, `:seeking`, `:stalled`, and `:volume-locked`. These selectors, while recognized, will not match any
 element as they require a live environment to check element states and browser states. This just prevents Soup Sieve
 from failing when any of these selectors are specified.
-   **NEW**: A number of existing pseudo-classes are no longer noted as experimental.
-   **FIX**: Typing fixes.

Links

• PyPI: https://pypi.org/project/soupsieve
• Changelog: https://data.safetycli.com/changelogs/soupsieve/

[pyup-bot]

Closing this in favor of #1092