Upgrade sphinx-markdown-builder

.github/actions/install-sphinx-markdown-builder/action.yml

@@ -9,6 +9,6 @@ runs:
     - shell: bash
       run: |
         set -x
-        commit=b259de1dc97573a71470a1d71c3d83535934136b
-        pip install git+https://github.com/krobelus/sphinx-markdown-builder@"$commit"
+        commit=7c4daaf39a92f93deec948ecc1772e23bac44588
+        pip install git+https://github.com/liran-funaro/sphinx-markdown-builder@"$commit"
         python -c 'import sphinx_markdown_builder'

build_tools/release-notes.sh

@@ -93,7 +93,7 @@ sphinx-build >&2 -j auto \
     -d "$relnotes_tmp/doctree" "$relnotes_tmp/fake-workspace/doc_src" "$relnotes_tmp/out" \
     -D markdown_http_base="https://fishshell.com/docs/$minor_version" \
     -D markdown_uri_doc_suffix=".html" \
-    -D markdown_github_flavored=1 \
+    -D markdown_flavor=github \
     "$@"
 
 # Skip changelog header