ci: set base branch for release-1.10 markdown link checks

Signed-off-by: cprivitere <[email protected]>

Author: cprivitere

.github/workflows/pr-md-link-check.yaml

@@ -20,4 +20,4 @@ jobs:
         use-quiet-mode: 'yes'
         config-file: .markdownlinkcheck.json
         check-modified-files-only: 'yes'
-        base-branch: main
+        base-branch: release-1.10