Update GitHub Actions to use newer action versions

Author: two-dimensional-array

.github/workflows/build.yml

@@ -11,7 +11,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Pull project
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
         with:
           submodules: 'recursive'
 
@@ -24,13 +24,13 @@ jobs:
           make all
 
       - name: Download Release firmware
-        uses: actions/upload-artifact@v3
+        uses: actions/upload-artifact@v4
         with:
           name: SnakeRelease
           path: Release/Snake.*
 
       - name: Download Debug firmware
-        uses: actions/upload-artifact@v3
+        uses: actions/upload-artifact@v4
         with:
           name: SnakeDebug
           path: Debug/Snake.*