chore: bump actions/checkout from 4 to 5

Author: Hejsil

.github/workflows/main.yml

@@ -12,7 +12,7 @@ jobs:
         optimize: [Debug, ReleaseSmall, ReleaseSafe, ReleaseFast]
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v5
       - uses: mlugg/setup-zig@v2
         with:
           version: master
@@ -21,7 +21,7 @@ jobs:
   lint:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v5
       - uses: mlugg/setup-zig@v2
         with:
           version: master