Pin actions/checkout action to de0fac2

Author: citygeo-bot[bot]

.github/workflows/mulesoft_pom_xml.yaml

@@ -11,7 +11,7 @@ jobs:
       contents: read
     steps:
       - name: Checkout this repo
-        uses: actions/checkout@v6
+        uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6
 
       - name: Get pom.xml parameters for this branch
         id: pomxml