ci: pins markdown-link-check due to regression (#3757)

Signed-off-by: Adrian Cole <adrian@tetrate.io>

build-bin/configure_lint

@@ -1,7 +1,8 @@
 #!/bin/sh -ue
 
 # Attempt to install markdown-link-check if absent
-markdown-link-check -V || npm install -g markdown-link-check
+# TODO: unpin version following tcort/markdown-link-check#304
+markdown-link-check -V || npm install -g markdown-link-check@3.11.2
 
 # Attempt to install yamllint if absent
 yamllint || pip install --user yamllint