Update dependency markdown to v3.7

| datasource | package  | from | to  |
| ---------- | -------- | ---- | --- |
| pypi       | markdown | 3.6  | 3.7 |


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

Author: renovate[bot]

docs/requirements.txt

@@ -1,6 +1,6 @@
 mkdocs==1.5.3
 mike==2.1.3
-markdown==3.6
+markdown==3.7
 mkdocs-material==9.5.18
 
 # Markdown extensions