Bump actions/upload-artifact from 3 to 4 (#143)

Include OS in artifact names:

Uploading to the same named Artifact multiple times is not allowed
with actions/upload-artifact@v4

https://github.com/actions/upload-artifact/tree/cf8714cfeaba5687a442b9bcb85b29e23f468dfa#v4---whats-new

.github/workflows/packages.yml

@@ -25,7 +25,7 @@ jobs:
       - name: Build
         run: build/tar 1
       - name: Upload github artifact
-        uses: actions/upload-artifact@v3
+        uses: actions/upload-artifact@v4
         with:
           path: "*.tar.gz"
           name: tar
@@ -58,10 +58,10 @@ jobs:
           outputs: builds
 
       - name: Upload GitHub artifact
-        uses: actions/upload-artifact@v3
+        uses: actions/upload-artifact@v4
         with:
           path: "builds/**/*.deb"
-          name: debs
+          name: debs-${{ matrix.os }}
 
       - name: Upload to PackageCloud
         if: startsWith(github.ref, 'refs/tags/v')

.github/workflows/rpm.yml

@@ -71,10 +71,10 @@ jobs:
             version=${{ env.version }}
           outputs: RPMS
 
-      - uses: actions/upload-artifact@v3
+      - uses: actions/upload-artifact@v4
         name: Upload artifact
         with:
-          name: rpm-packages
+          name: rpm-packages-${{ matrix.os }}
           path: RPMS
 
       - name: Upload to Packagecloud