In Python 3.12+, invalid escape sequences changed from a
DeprecationWarning to SyntaxWarning.

/usr/lib/x86_64-linux-gnu/pluma/plugins/snippets/Document.py:830: SyntaxWarning: invalid escape sequence '\/'
  prot1 = re.match('(^[a-z]+:\/\/|\/)(.*)', first)
/usr/lib/x86_64-linux-gnu/pluma/plugins/snippets/Document.py:831: SyntaxWarning: invalid escape sequence '\/'
  prot2 = re.match('(^[a-z]+:\/\/|\/)(.*)', second)
/usr/lib/x86_64-linux-gnu/pluma/plugins/snippets/SubstitutionParser.py:162: SyntaxWarning: invalid escape sequence '\s'
  match = re.match('\\\\?%s\s*' % self.REG_GROUP, tokens)

Move the taglist plugin from the left side panel to the right panel.
This reflects the plugin's purpose better as a reference tool for tag
insertion and is more similar to how other IDEs have tags and symbols on
the right side.

Add a third panel on the right side of the editor window, enabling
a three-panel layout with left, right, and bottom panes.

The right panel is hidden by default and its state persists across
sessions. The main use case is enabling plugins for previews, document
outline viewers, or tag lists, similar to other IDEs.

Bumps [actions/checkout](https://github.com/actions/checkout) from 5 to 6.
- [Release notes](https://github.com/actions/checkout/releases)
- [Changelog](https://github.com/actions/checkout/blob/main/CHANGELOG.md)
- [Commits](https://github.com/actions/checkout/compare/v5...v6)

---
updated-dependencies:
- dependency-name: actions/checkout
  dependency-version: '6'
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <support@github.com>

Fixes header conflicts on systems where glib has girepository-2.0 but
libpeas still uses the old gobject-introspection-1.0 headers.

Fixes https://github.com/mate-desktop/pluma/issues/729

Starting with version 1.80, girepository moved from gobject
introspection into glib and bump the API version to 2.0. This change
adds flags to support both API versions.