Update actions/checkout action to v6

Author: renovate[bot]

.github/workflows/build.yml

@@ -27,7 +27,7 @@ jobs:
     name: Build Packages
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
       - name: Setup Java
         uses: actions/setup-java@v4
         with:
@@ -66,7 +66,7 @@ jobs:
 
       # Build Spore-ModAPI
       - name: Checkout Spore-ModAPI
-        uses: actions/checkout@v4
+        uses: actions/checkout@v6
         with:
           repository: 'emd4600/Spore-ModAPI'
           ref: ${{ env.SPORE_MOD_API_REF }}
@@ -81,7 +81,7 @@ jobs:
       # Build Spore-LuaAPI
       - name: Checkout Spore-LuaAPI
         if: ${{ steps.cache-spore-luaapi.outputs.cache-hit != 'true' }}
-        uses: actions/checkout@v4
+        uses: actions/checkout@v6
         with:
           repository: 'Zarklord/Spore-LuaAPI'
           ref: ${{ env.SPORE_LUA_API_REF }}
@@ -111,7 +111,7 @@ jobs:
     permissions:
       contents: write
     steps:      
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
       - uses: actions/download-artifact@v4
         with:
           path: ${{ github.workspace }}/Sporemod