Bump regex from 2023.10.3 to 2023.12.25 in /stix_shifter

[dependabot]

Bumps regex from 2023.10.3 to 2023.12.25.

Changelog

Sourced from regex's changelog.

Version: 2023.12.25

Cannot get release notification action in main.yml to work. Commenting it out for now.

Version: 2023.12.24

Fixed invalid main.yml.

Version: 2023.12.23

The escape function no longer escapes \x00. It's not necessary.
Inline flags can now be turned off and apply to what follows.
Added \R to match line endings.

Version: 2023.10.3

Updated to Unicode 15.1.0.

Version: 2023.8.8

Git issue 508: Regex doesn't build using CPython main (3.13.0a0)
Removed usage of _PyBytes_Join and did a little tidying of the code that makes the result string.

Version: 2023.6.3

Git issue 498: Conditional negative lookahead inside positive lookahead fails to match
Conditional node needed an additional member that points to the true branch.

Version: 2023.5.5

Removed semicolon after 'else' in 'munge_name'.

Version: 2023.5.4

Fixed pyproject.toml and setup.py.

Version: 2023.5.3

pyproject.toml was missing.

Version: 2023.5.2

Added pyproject.toml.

Version: 2023.3.23

Git issue 495: Running time for failing fullmatch increases rapidly with input length
Re-enabled modified repeat guards due to regression in speed caused by excessive backtracking.

... (truncated)

Commits

• 647c006 Further fixes in main.yml.
• d0afd79 Another fix in main.yml.
• c1f1f2a Fixed invalid main.yml.
• cdcbf36 The escape function no longer escapes \x00. It's not necessary.
• See full diff in compare view

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