Update GitHub Artifact Actions to v4

.gitea/workflows/build.yaml

@@ -40,7 +40,7 @@ jobs:
         run: west build -s zmk/app -b nice_nano_v2 -- -DSHIELD=cradio_left -DZMK_CONFIG="${GITHUB_WORKSPACE}/config"
       - name: Rename and upload artifact (Left)
         run: mv build/zephyr/zmk.uf2 cradio_left_nice_nano_v2.uf2
-      - uses: actions/upload-artifact@v3
+      - uses: actions/upload-artifact@v4
         with:
           path: cradio_left_nice_nano_v2.uf2
           name: left
@@ -79,7 +79,7 @@ jobs:
         run: west build --pristine -s zmk/app -b nice_nano_v2 -- -DSHIELD=cradio_right -DZMK_CONFIG="${GITHUB_WORKSPACE}/config"
       - name: Rename and upload artifact (Right)
         run: mv build/zephyr/zmk.uf2 cradio_right_nice_nano_v2.uf2
-      - uses: actions/upload-artifact@v3
+      - uses: actions/upload-artifact@v4
         with:
           path: cradio_right_nice_nano_v2.uf2
           name: right
@@ -97,16 +97,16 @@ jobs:
           apt-get update;
           apt-get install --yes --no-install-recommends nodejs zip
       - name: Download artifacts
-        uses: actions/download-artifact@v3
+        uses: actions/download-artifact@v4
         with:
           name: left
           path: firmware/
-      - uses: actions/download-artifact@v3
+      - uses: actions/download-artifact@v4
         with:
           name: right
           path: firmware/
       - name: Upload combined firmware artifacts
-        uses: actions/upload-artifact@v3
+        uses: actions/upload-artifact@v4
         with:
           path: firmware/
           name: firmware