Update actions/checkout action to v6 (#46)

Author: renovate-bot

.github/workflows/build.yml

@@ -21,13 +21,13 @@ jobs:
     runs-on: 'ubuntu-24.04'
     steps:
       - name: Clone Repository (Latest)
-        uses: actions/checkout@93cb6efe18208431cddfb8368fd83d5badbf9bfd # v5.0.1
+        uses: actions/checkout@8e8c483db84b4bee98b60c0593521ed34d9990e8 # v6.0.1
         with:
           repository: 'mihonapp/mihon'
           fetch-depth: 0
         if: github.event.inputs.git-ref == ''
       - name: Clone Repository (Custom Ref)
-        uses: actions/checkout@93cb6efe18208431cddfb8368fd83d5badbf9bfd # v5.0.1
+        uses: actions/checkout@8e8c483db84b4bee98b60c0593521ed34d9990e8 # v6.0.1
         if: github.event.inputs.git-ref != ''
         with:
           repository: 'mihonapp/mihon'