chore(deps): bump mkdocs-material from 9.6.17 to 9.6.18 in /docs (aws-powertools#7235)

Bumps [mkdocs-material](https://github.com/squidfunk/mkdocs-material) from 9.6.17 to 9.6.18.
- [Release notes](https://github.com/squidfunk/mkdocs-material/releases)
- [Changelog](https://github.com/squidfunk/mkdocs-material/blob/master/CHANGELOG)
- [Commits](squidfunk/mkdocs-material@9.6.17...9.6.18)

---
updated-dependencies:
- dependency-name: mkdocs-material
  dependency-version: 9.6.18
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

Author: dependabot[bot]

docs/requirements.in

@@ -1,4 +1,4 @@
 mkdocs-git-revision-date-plugin==0.3.2
 mkdocstrings-python==1.17.0
 mkdocs-llmstxt==0.3.1
-mkdocs-material==9.6.17
+mkdocs-material==9.6.18

docs/requirements.txt

@@ -290,9 +290,9 @@ mkdocs-llmstxt==0.3.1 \
     --hash=sha256:123119d9b984c1d1224ed5af250bfbc49879ad83decdaff59d8b0ebb459ddc54 \
     --hash=sha256:31f5b6aaae6123c09a2b1c32912c3eb21ccb356b5db7abb867f105e8cc392653
     # via -r requirements.in
-mkdocs-material==9.6.17 \
-    --hash=sha256:221dd8b37a63f52e580bcab4a7e0290e4a6f59bd66190be9c3d40767e05f9417 \
-    --hash=sha256:48ae7aec72a3f9f501a70be3fbd329c96ff5f5a385b67a1563e5ed5ce064affe
+mkdocs-material==9.6.18 \
+    --hash=sha256:a2eb253bcc8b66f8c6eaf8379c10ed6e9644090c2e2e9d0971c7722dc7211c05 \
+    --hash=sha256:dbc1e146a0ecce951a4d84f97b816a54936cdc9e1edd1667fc6868878ac06701
     # via -r requirements.in
 mkdocs-material-extensions==1.3.1 \
     --hash=sha256:10c9511cea88f568257f960358a467d12b970e1f7b2c0e5fb2bb48cab1928443 \