Use newer versions of checkout and upload-artifact

.github/workflows/build.yml

@@ -12,7 +12,7 @@ jobs:
       image: ghcr.io/nicoverbruggen/fntbld-oci:latest
 
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v5
 
       - name: Build fonts
         run: python3 build.py
@@ -27,13 +27,13 @@ jobs:
           mv out/ttf/KF_*.ttf out/kf/
 
       - name: Upload artifact
-        uses: actions/upload-artifact@v4
+        uses: actions/upload-artifact@v6
         with:
           name: Readerly
           path: out/ttf/*.ttf
 
       - name: Upload Kobo artifact
-        uses: actions/upload-artifact@v4
+        uses: actions/upload-artifact@v6
         with:
           name: KF_Readerly
           path: out/kf/*.ttf
@@ -46,7 +46,7 @@ jobs:
 
       - name: Upload release zips
         if: startsWith(github.ref, 'refs/tags/')
-        uses: actions/upload-artifact@v4
+        uses: actions/upload-artifact@v6
         with:
           name: Readerly-release
           path: |
@@ -61,7 +61,7 @@ jobs:
       contents: write
 
     steps:
-      - uses: actions/download-artifact@v4
+      - uses: actions/download-artifact@v6
         with:
           name: Readerly-release