Bump pkgconfig from 1.5.5 to 1.6.0 (#12218)

Bumps [pkgconfig](https://github.com/matze/pkgconfig) from 1.5.5 to
1.6.0.
<details>
<summary>Release notes</summary>
<p><em>Sourced from <a
href="https://github.com/matze/pkgconfig/releases">pkgconfig's
releases</a>.</em></p>
<blockquote>
<h2>v1.6.0</h2>
<p>Changes see there: <a
href="https://github.com/matze/pkgconfig?tab=readme-ov-file#changelog">https://github.com/matze/pkgconfig?tab=readme-ov-file#changelog</a></p>
</blockquote>
</details>
<details>
<summary>Commits</summary>
<ul>
<li><a
href="https://github.com/matze/pkgconfig/commit/463480d0a0af629fed927b89ddcf2d406b22e337"><code>463480d</code></a>
update changelog</li>
<li><a
href="https://github.com/matze/pkgconfig/commit/21cf3b1a4deadbc27c93ed04e3cbad1a9e0db030"><code>21cf3b1</code></a>
README: pkg-config and pkgconf, <a
href="https://redirect.github.com/matze/pkgconfig/issues/75">#75</a></li>
<li><a
href="https://github.com/matze/pkgconfig/commit/4c62cb12ef85faf6dd70c590b7ed8510086c39aa"><code>4c62cb1</code></a>
brew: use pkgconf instead of pkg-config</li>
<li><a
href="https://github.com/matze/pkgconfig/commit/784425f5bedb3b0d3642ba4105e6cfd681e20cb6"><code>784425f</code></a>
CI: update actions</li>
<li><a
href="https://github.com/matze/pkgconfig/commit/ca1d0092c69d456b88cedc6d3f56f4e6699db8a8"><code>ca1d009</code></a>
CI: use macos-15 / py313</li>
<li><a
href="https://github.com/matze/pkgconfig/commit/3cf03e0360a58e0e905158fe978943d0c0e3974d"><code>3cf03e0</code></a>
CI: remove duplicate py313 job</li>
<li><a
href="https://github.com/matze/pkgconfig/commit/abf083a40b1c3a00b3f9b53548e6ddc59d2741c8"><code>abf083a</code></a>
Merge pull request <a
href="https://redirect.github.com/matze/pkgconfig/issues/79">#79</a>
from ThomasWaldmann/misc-updates</li>
<li><a
href="https://github.com/matze/pkgconfig/commit/5d16c48978d76dbbaa4dd65749ddd59e92d9c541"><code>5d16c48</code></a>
work around tox setup.cfg bug</li>
<li><a
href="https://github.com/matze/pkgconfig/commit/7f9545db9ede6989fb53983d81117241441dd4f3"><code>7f9545d</code></a>
CI: test on Python 3.14</li>
<li><a
href="https://github.com/matze/pkgconfig/commit/76ce1ca1c5b4bbd4a39edbed2f3893995287afbc"><code>76ce1ca</code></a>
code: fix typos and grammar</li>
<li>Additional commits viewable in <a
href="https://github.com/matze/pkgconfig/compare/v1.5.5...v1.6.0">compare
view</a></li>
</ul>
</details>
<br />


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requirements/constraints.txt

@@ -136,7 +136,7 @@ pathspec==1.0.4
     # via mypy
 pip-tools==7.5.3
     # via -r requirements/dev.in
-pkgconfig==1.5.5
+pkgconfig==1.6.0
     # via -r requirements/test-common.in
 platformdirs==4.9.4
     # via

requirements/dev.txt

@@ -133,7 +133,7 @@ pathspec==1.0.4
     # via mypy
 pip-tools==7.5.3
     # via -r requirements/dev.in
-pkgconfig==1.5.5
+pkgconfig==1.6.0
     # via -r requirements/test-common.in
 platformdirs==4.9.4
     # via

requirements/test-common.txt

@@ -48,7 +48,7 @@ packaging==26.0
     # via pytest
 pathspec==1.0.4
     # via mypy
-pkgconfig==1.5.5
+pkgconfig==1.6.0
     # via -r requirements/test-common.in
 pluggy==1.6.0
     # via

requirements/test-ft.txt

@@ -75,7 +75,7 @@ packaging==26.0
     #   pytest
 pathspec==1.0.4
     # via mypy
-pkgconfig==1.5.5
+pkgconfig==1.6.0
     # via -r requirements/test-common.in
 pluggy==1.6.0
     # via

requirements/test.txt

@@ -75,7 +75,7 @@ packaging==26.0
     #   pytest
 pathspec==1.0.4
     # via mypy
-pkgconfig==1.5.5
+pkgconfig==1.6.0
     # via -r requirements/test-common.in
 pluggy==1.6.0
     # via