Bump the dependencies group across 1 directory with 3 updates (#505)

Bumps the dependencies group with 3 updates in the /.config directory: [backrefs](https://github.com/facelessuser/backrefs), [pygments](https://github.com/pygments/pygments) and [pymdown-extensions](https://github.com/facelessuser/pymdown-extensions).


Updates `backrefs` from 5.8 to 5.9
- [Release notes](https://github.com/facelessuser/backrefs/releases)
- [Commits](facelessuser/backrefs@5.8...5.9)

Updates `pygments` from 2.19.1 to 2.19.2
- [Release notes](https://github.com/pygments/pygments/releases)
- [Changelog](https://github.com/pygments/pygments/blob/master/CHANGES)
- [Commits](pygments/pygments@2.19.1...2.19.2)

Updates `pymdown-extensions` from 10.15 to 10.16
- [Release notes](https://github.com/facelessuser/pymdown-extensions/releases)
- [Commits](facelessuser/pymdown-extensions@10.15...10.16)

---
updated-dependencies:
- dependency-name: backrefs
  dependency-version: '5.9'
  dependency-type: direct:production
  update-type: version-update:semver-minor
  dependency-group: dependencies
- dependency-name: pygments
  dependency-version: 2.19.2
  dependency-type: direct:production
  update-type: version-update:semver-patch
  dependency-group: dependencies
- dependency-name: pymdown-extensions
  dependency-version: '10.16'
  dependency-type: direct:production
  update-type: version-update:semver-minor
  dependency-group: dependencies
...

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

.config/constraints.txt

@@ -3,7 +3,7 @@
 argparse-manpage==4.6     # via ansible-compat (pyproject.toml)
 attrs==25.3.0             # via jsonschema, referencing
 babel==2.17.0             # via mkdocs-material
-backrefs==5.8             # via mkdocs-material
+backrefs==5.9             # via mkdocs-material
 beautifulsoup4==4.13.4    # via linkchecker, mkdocs-htmlproofer-plugin
 black==25.1.0             # via ansible-compat (pyproject.toml)
 cairocffi==1.7.1          # via cairosvg
@@ -56,8 +56,8 @@ pillow==11.2.1            # via cairosvg, mkdocs-ansible
 platformdirs==4.3.8       # via black, mkdocs-get-deps
 pluggy==1.6.0             # via pytest
 pycparser==2.22           # via cffi
-pygments==2.19.1          # via mkdocs-material, pytest
-pymdown-extensions==10.15  # via markdown-exec, mkdocs-ansible, mkdocs-material, mkdocstrings
+pygments==2.19.2          # via mkdocs-material, pytest
+pymdown-extensions==10.16  # via markdown-exec, mkdocs-ansible, mkdocs-material, mkdocstrings
 pytest==8.4.1             # via pytest-instafail, pytest-mock, pytest-plus, ansible-compat (pyproject.toml)
 pytest-instafail==0.5.0   # via ansible-compat (pyproject.toml)
 pytest-mock==3.14.1       # via ansible-compat (pyproject.toml)