.github: Update checkout action

Author: brancz

.github/workflows/container.yml

@@ -51,7 +51,7 @@ jobs:
         GORELEASER_CURRENT_TAG: "${{ env.goreleaser_current_tag }}"
     steps:
       - name: Check out the code
-        uses: actions/checkout@2541b1294d2704b0964813337f33b291d3f8596b # tag=v3.0.2
+        uses: actions/checkout@8e8c483db84b4bee98b60c0593521ed34d9990e8 # tag=v6.0.1
 
       - name: Set up Go
         uses: actions/setup-go@84cbf8094393cdc5fe1fe1671ff2647332956b1a # tag=v3.2.1