Update github actions

Author: maxgerhardt

.github/workflows/build.yml

@@ -10,12 +10,12 @@ jobs:
     runs-on: ${{ matrix.os }}
     steps:
       - name: Checkout PicoRVD
-        uses: actions/checkout@v3
+        uses: actions/checkout@v6
         with:
           path: PicoRVD
 
       - name: Checkout pico-sdk/1.5.1
-        uses: actions/checkout@v3
+        uses: actions/checkout@v6
         with:
           repository: raspberrypi/pico-sdk
           ref: 1.5.1
@@ -65,7 +65,7 @@ jobs:
 
       - name: Upload UF2 File
         if: ${{ matrix.os == 'ubuntu-latest' }}
-        uses: actions/upload-artifact@v3
+        uses: actions/upload-artifact@v6
         with:
           name: PicoRVD.uf2
           path: ${{github.workspace}}/PicoRVD/bin/picorvd.uf2