CI: bump actions to Node 24 majors, one artifact per target

Author: lolsborn

.github/workflows/build.yml

@@ -30,14 +30,14 @@ jobs:
             name: groundstation-wio
             kind: nrf52
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v7
 
-      - uses: actions/setup-python@v5
+      - uses: actions/setup-python@v6
         with:
           python-version: "3.11"
 
       - name: Cache PlatformIO
-        uses: actions/cache@v4
+        uses: actions/cache@v6
         with:
           path: |
             ~/.platformio
@@ -71,24 +71,12 @@ jobs:
           cp .pio/build/${{ matrix.environment }}/firmware.uf2 artifacts/${{ matrix.name }}.uf2
           python -c "from intelhex import IntelHex; IntelHex('.pio/build/${{ matrix.environment }}/firmware.hex').tobinfile('artifacts/${{ matrix.name }}.bin')"
 
-      - name: Upload .bin
-        uses: actions/upload-artifact@v4
+      # One artifact (zip) per target; releases re-attach the files individually
+      - name: Upload firmware
+        uses: actions/upload-artifact@v7
         with:
-          name: ${{ matrix.name }}.bin
-          path: artifacts/${{ matrix.name }}.bin
-
-      - name: Upload .hex
-        uses: actions/upload-artifact@v4
-        with:
-          name: ${{ matrix.name }}.hex
-          path: artifacts/${{ matrix.name }}.hex
-
-      - name: Upload .uf2
-        if: matrix.kind == 'nrf52'
-        uses: actions/upload-artifact@v4
-        with:
-          name: ${{ matrix.name }}.uf2
-          path: artifacts/${{ matrix.name }}.uf2
+          name: ${{ matrix.name }}
+          path: artifacts/
 
   # Tag pushes (v*) publish the firmware as raw release assets — unlike CI
   # artifacts, these download as plain .bin/.hex files, not zips
@@ -100,13 +88,13 @@ jobs:
       contents: write
     steps:
       - name: Download firmware
-        uses: actions/download-artifact@v4
+        uses: actions/download-artifact@v8
         with:
           path: dist
           merge-multiple: true
 
       - name: Create release
-        uses: softprops/action-gh-release@v2
+        uses: softprops/action-gh-release@v3
         with:
           files: dist/*
           prerelease: ${{ contains(github.ref_name, '-') }}