chore: lock plugin versions (#6089)

Author: YiniXu9506

scripts/verify-link-anchors.sh

@@ -7,7 +7,7 @@
 ROOT=$(unset CDPATH && cd $(dirname "${BASH_SOURCE[0]}")/.. && pwd)
 cd $ROOT
 
-npm install -g remark-cli remark-lint breeswish/remark-lint-pingcap-docs-anchor
+npm install -g remark-cli@9.0.0 remark-lint@8.0.0 breeswish/remark-lint-pingcap-docs-anchor
 
 echo "info: checking links anchors under $ROOT directory..."