Bumped lychee action (#3284)

* Bumped lychee action

* Pin to hash

* Empty commit

* Added version comment

Author: mnocon

.github/workflows/link_check.yaml

@@ -91,7 +91,7 @@ jobs:
                       lychee-
 
             - name: Check links
-              uses: lycheeverse/lychee-action@master
+              uses: lycheeverse/lychee-action@e7477775783ea5526144ba13e8db5eec57747ce8 # v2.9.0
               with:
                   args: >-
                       --config lychee.toml