Update setup-qemu-action version to v2 (#14)

This should hopefully fix the following warning:
```
Node.js 12 actions are deprecated. For more information see: https://github.blog/changelog/2022-09-22-github-actions-all-actions-will-begin-running-on-node16-instead-of-node12/. Please update the following actions to use Node.js 16: docker/setup-qemu-action@v1
```

.github/workflows/snap.yaml

@@ -39,7 +39,7 @@ jobs:
         julia --project=. -e 'using Pkg; Pkg.instantiate()'
         julia --project=. create-snapcraft-yaml.jl "${{ inputs.release }}"
     - name: Set up QEMU
-      uses: docker/setup-qemu-action@v1
+      uses: docker/setup-qemu-action@v2
     - name: Build Snap
       uses: diddlesnaps/snapcraft-multiarch-action@v1
       id: snapcraft