Move to mainline checkout actions

We're now running on git.gmem.ca so this workaround is no longer needed

.gitea/workflows/build-pi-img.yml

@@ -10,10 +10,9 @@ jobs:
     runs-on: debian-latest-arm
     steps:
       - name: Checkout code
-        uses: https://github.com/RouxAntoine/checkout@v3.5.4
+        uses: actions/checkout@v3.5.4
         with:
           ref: trunk
-          github-server-url: 'https://vancouver.scorpion-ghost.ts.net/git/' 
       - name: Install prerequisites
         run: apt update && apt install -y sudo
       - name: Install Nix

.gitea/workflows/lint-homelab.yml

@@ -6,7 +6,7 @@ jobs:
     runs-on: debian-latest
     steps:
       - name: Checkout code
-        uses: https://github.com/RouxAntoine/checkout@v3.5.4
+        uses: actions/checkout@v3.5.3
         with:
           ref: trunk
       - name: Lint Code Base

.gitea/workflows/sync-gmemca.yml

@@ -10,7 +10,7 @@ jobs:
     runs-on: debian-latest
     steps:
       - name: Checkout code
-        uses: https://github.com/RouxAntoine/checkout@v3.5.4
+        uses: actions/checkout@v3.5.3
         with:
           ref: trunk
       - name: Install AWS CLI