Bump markdown from 3.5 to 3.5.1 in /config/requirements

Bumps [markdown](https://github.com/Python-Markdown/markdown) from 3.5 to 3.5.1.
- [Release notes](https://github.com/Python-Markdown/markdown/releases)
- [Changelog](https://github.com/Python-Markdown/markdown/blob/master/docs/changelog.md)
- [Commits](Python-Markdown/markdown@3.5...3.5.1)

---
updated-dependencies:
- dependency-name: markdown
  dependency-type: direct:development
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <[email protected]>

config/requirements/dev_lock.txt

@@ -772,9 +772,9 @@ kombu==5.3.2 \
     --hash=sha256:0ba213f630a2cb2772728aef56ac6883dc3a2f13435e10048f6e97d48506dbbd \
     --hash=sha256:b753c9cfc9b1e976e637a7cbc1a65d446a22e45546cd996ea28f932082b7dc9e
     # via celery
-markdown==3.5 \
-    --hash=sha256:4afb124395ce5fc34e6d9886dab977fd9ae987fc6e85689f08278cf0c69d4bf3 \
-    --hash=sha256:a807eb2e4778d9156c8f07876c6e4d50b5494c5665c4834f67b06459dfd877b3
+markdown==3.5.1 \
+    --hash=sha256:5874b47d4ee3f0b14d764324d2c94c03ea66bee56f2d929da9f2508d65e722dc \
+    --hash=sha256:b65d7beb248dc22f2e8a31fb706d93798093c308dc1aba295aedeb9d41a813bd
     # via
     #   mkdocs
     #   mkdocs-autorefs