chore(deps): update dependency mkdocs-material to v9.6.15 (#317)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Author: renovate[bot]

docs/user-guide/requirements/requirements.txt

@@ -246,9 +246,9 @@ mkdocs-git-revision-date-localized-plugin==1.4.7 \
     --hash=sha256:056c0a90242409148f1dc94d5c9d2c25b5b8ddd8de45489fa38f7fa7ccad2bc4 \
     --hash=sha256:10a49eff1e1c3cb766e054b9d8360c904ce4fe8c33ac3f6cc083ac6459c91953
     # via -r requirements.in
-mkdocs-material==9.6.14 \
-    --hash=sha256:39d795e90dce6b531387c255bd07e866e027828b7346d3eba5ac3de265053754 \
-    --hash=sha256:3b9cee6d3688551bf7a8e8f41afda97a3c39a12f0325436d76c86706114b721b
+mkdocs-material==9.6.15 \
+    --hash=sha256:64adf8fa8dba1a17905b6aee1894a5aafd966d4aeb44a11088519b0f5ca4f1b5 \
+    --hash=sha256:ac969c94d4fe5eb7c924b6d2f43d7db41159ea91553d18a9afc4780c34f2717a
     # via -r requirements.in
 mkdocs-material-extensions==1.3.1 \
     --hash=sha256:10c9511cea88f568257f960358a467d12b970e1f7b2c0e5fb2bb48cab1928443 \