Update dependency soupsieve to v2.6

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
soupsieve	==2.3.2.post1 -> ==2.6

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Release Notes

facelessuser/soupsieve (soupsieve)

v2.6

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2.6

• NEW: Add official support for Python 3.13.
• NEW: Add support for & as scoping root per the CSS Nesting Module, Level 1. When & is used outside the
  context of nesting, it is treated as the scoping root (equivalent to :scope).
• FIX: Improve error message when an unrecognized pseudo-class is used.

v2.5

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2.5

• NEW: Update to support Python 3.12.
• NEW: Drop support for Python 3.7.

v2.4.1

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2.4.1

• FIX: Attribute syntax for case insensitive flag optionally allows a space, it does not require one.

v2.4

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2.4

• NEW: Update to support changes related to :lang() in the official CSS spec. :lang("") should match unspecified
  languages, e.g. lang="", but not lang=und.
• NEW: Only :is() and :where() should allow forgiving selector lists according to latest CSS (as far as Soup
  Sieve supports "forgiving" which is limited to empty selectors).
• NEW: Formally drop Python 3.6.
• NEW: Formally declare support for Python 3.11.

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