Bump certifi from 2026.5.20 to 2026.6.17 (aio-libs#12952)

Bumps [certifi](https://github.com/certifi/python-certifi) from
2026.5.20 to 2026.6.17.
<details>
<summary>Commits</summary>
<ul>
<li><a
href="https://github.com/certifi/python-certifi/commit/d0ac52f3d93a514224197c7efb66c41b1beae5d1"><code>d0ac52f</code></a>
2026.06.17 (<a
href="https://redirect.github.com/certifi/python-certifi/issues/418">#418</a>)</li>
<li><a
href="https://github.com/certifi/python-certifi/commit/d46de621787c609158579929f44b91ce731d01b8"><code>d46de62</code></a>
Bump actions/checkout from 6.0.2 to 6.0.3 (<a
href="https://redirect.github.com/certifi/python-certifi/issues/417">#417</a>)</li>
<li><a
href="https://github.com/certifi/python-certifi/commit/6c183ec39d81135350dd44abd0e5daefc8e35b9d"><code>6c183ec</code></a>
fix: update Requests docs link to canonical URL (<a
href="https://redirect.github.com/certifi/python-certifi/issues/415">#415</a>)</li>
<li><a
href="https://github.com/certifi/python-certifi/commit/36e35680e0dc42c70cd60bfe440e92e7137f5a1c"><code>36e3568</code></a>
Bump dessant/lock-threads from 6.0.0 to 6.0.2</li>
<li>See full diff in <a
href="https://github.com/certifi/python-certifi/compare/2026.05.20...2026.06.17">compare
view</a></li>
</ul>
</details>
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requirements/constraints.txt

@@ -47,7 +47,7 @@ brotli==1.2.0 ; platform_python_implementation == "CPython" and sys_platform !=
     # via -r requirements/runtime-deps.in
 build==1.5.0
     # via pip-tools
-certifi==2026.5.20
+certifi==2026.6.17
     # via requests
 cffi==2.0.0
     # via

requirements/dev.txt

@@ -47,7 +47,7 @@ brotli==1.2.0 ; platform_python_implementation == "CPython" and sys_platform !=
     # via -r requirements/runtime-deps.in
 build==1.5.0
     # via pip-tools
-certifi==2026.5.20
+certifi==2026.6.17
     # via requests
 cffi==2.0.0
     # via

requirements/doc-spelling.txt

@@ -10,7 +10,7 @@ alabaster==1.0.0
     # via sphinx
 babel==2.18.0
     # via sphinx
-certifi==2026.5.20
+certifi==2026.6.17
     # via requests
 charset-normalizer==3.4.7
     # via requests

requirements/doc.txt

@@ -10,7 +10,7 @@ alabaster==1.0.0
     # via sphinx
 babel==2.18.0
     # via sphinx
-certifi==2026.5.20
+certifi==2026.6.17
     # via requests
 charset-normalizer==3.4.7
     # via requests