Bump actions/upload-artifact from 5 to 6

Bumps [actions/upload-artifact](https://github.com/actions/upload-artifact) from 5 to 6.
- [Release notes](https://github.com/actions/upload-artifact/releases)
- [Commits](actions/upload-artifact@v5...v6)

---
updated-dependencies:
- dependency-name: actions/upload-artifact
  dependency-version: '6'
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

.github/workflows/build_and_test_arm.yaml

@@ -138,15 +138,15 @@ jobs:
         run: |
           make DISK=/tmp/elemental-${{ env.FLAVOR }}.${{ env.ARCH}}.qcow2 ELMNTL_ACCEL=none ELMNTL_MACHINETYPE=virt ELMNTL_TARGETARCH=${{ env.ARCH }} ELMNTL_FIRMWARE=/usr/share/AAVMF/AAVMF_CODE.fd ${{ matrix.test }}
       - name: Upload serial console for ${{ matrix.test }}
-        uses: actions/upload-artifact@v5
+        uses: actions/upload-artifact@v6
         if: always()
         with:
           name: serial-${{ env.ARCH }}-${{ env.FLAVOR }}-${{ matrix.test }}.log
           path: tests/serial.log
           if-no-files-found: error
           overwrite: true
       - name: Upload qemu stdout for ${{ matrix.test }}
-        uses: actions/upload-artifact@v5
+        uses: actions/upload-artifact@v6
         if: failure()
         with:
           name: vmstdout-${{ env.ARCH }}-${{ env.FLAVOR }}-${{ matrix.test }}.log
@@ -189,15 +189,15 @@ jobs:
         run: |
           make ISO=/tmp/elemental-${{ env.FLAVOR }}.${{ env.ARCH}}.iso ELMNTL_ACCEL=none ELMNTL_MACHINETYPE=virt ELMNTL_TARGETARCH=${{ env.ARCH }} ELMNTL_FIRMWARE=/usr/share/AAVMF/AAVMF_CODE.fd test-installer
       - name: Upload serial console for installer tests
-        uses: actions/upload-artifact@v5
+        uses: actions/upload-artifact@v6
         if: always()
         with:
           name: serial-${{ env.ARCH }}-${{ env.FLAVOR }}-installer.log
           path: tests/serial.log
           if-no-files-found: error
           overwrite: true
       - name: Upload qemu stdout for installer tests
-        uses: actions/upload-artifact@v5
+        uses: actions/upload-artifact@v6
         if: failure()
         with:
           name: vmstdout-${{ env.ARCH }}-${{ env.FLAVOR }}-installer.log

.github/workflows/build_and_test_x86.yaml

@@ -222,15 +222,15 @@ jobs:
         run: |
           make DISK=/tmp/elemental-${{ env.FLAVOR }}.${{ env.ARCH}}.qcow2 ELMNTL_TARGETARCH=${{ env.ARCH }} ELMNTL_FIRMWARE=/usr/share/OVMF/OVMF_CODE_4M.fd ${{ matrix.test }}
       - name: Upload serial console for ${{ matrix.test }}
-        uses: actions/upload-artifact@v5
+        uses: actions/upload-artifact@v6
         if: always()
         with:
           name: serial-${{ env.ARCH }}-${{ env.FLAVOR }}-${{ matrix.test }}.log
           path: tests/serial.log
           if-no-files-found: error
           overwrite: true
       - name: Upload qemu stdout for ${{ matrix.test }}
-        uses: actions/upload-artifact@v5
+        uses: actions/upload-artifact@v6
         if: failure()
         with:
           name: vmstdout-${{ env.ARCH }}-${{ env.FLAVOR }}-${{ matrix.test }}.log
@@ -284,15 +284,15 @@ jobs:
         run: |
           make ISO=/tmp/elemental-${{ env.FLAVOR }}.${{ env.ARCH}}.iso ELMNTL_TARGETARCH=${{ env.ARCH }} ELMNTL_FIRMWARE=/usr/share/OVMF/OVMF_CODE_4M.fd test-installer
       - name: Upload serial console for installer tests
-        uses: actions/upload-artifact@v5
+        uses: actions/upload-artifact@v6
         if: always()
         with:
           name: serial-${{ env.ARCH }}-${{ env.FLAVOR }}-installer.log
           path: tests/serial.log
           if-no-files-found: error
           overwrite: true
       - name: Upload qemu stdout for installer tests
-        uses: actions/upload-artifact@v5
+        uses: actions/upload-artifact@v6
         if: failure()
         with:
           name: vmstdout-${{ env.ARCH }}-${{ env.FLAVOR }}-installer.log