Bump actions/checkout from 4 to 5 (#42)

Author: dependabot[bot]

.github/workflows/docs.yml

@@ -19,7 +19,7 @@ jobs:
     name: Build docs website
     runs-on: ubuntu-latest
     steps:
-    - uses: actions/checkout@v4
+    - uses: actions/checkout@v5
     - uses: mlugg/setup-zig@v2
       with:
         version: 0.14.0

.github/workflows/main.yml

@@ -13,7 +13,7 @@ jobs:
         os: [ubuntu-latest, macos-latest, windows-latest]
     runs-on: ${{ matrix.os }}
     steps:
-    - uses: actions/checkout@v4
+    - uses: actions/checkout@v5
     - uses: mlugg/setup-zig@v2
       with:
         version: 0.14.0