ci: unpin the wasi-nn tasks from an older Ubuntu (#6089)

* ci: unpin the wasi-nn tasks from an older Ubuntu

Previously, OpenVINO's lack of APT packages for Ubuntu 22.04 (`jammy`)
prevented us from upgrading the GitHub runner to use `ubuntu-latest`. I
updated the `install-openvino-action` to substitute in the `focal`
packages in this case (this is what the OpenVINO team considers the fix)
so this pin should no longer be necessary. Fixes #5408.

(Run all CI actions: prtest:full)

* vet: audit the openvino version bump

.github/workflows/main.yml

@@ -471,14 +471,17 @@ jobs:
     needs: determine
     if: needs.determine.outputs.run-full
     name: Test wasi-nn module
-    runs-on: ubuntu-20.04 # TODO: remove pin when fixed (#5408)
+    runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v3
         with:
           submodules: true
       - uses: ./.github/actions/install-rust
       - run: rustup target add wasm32-wasi
-      - uses: abrown/install-openvino-action@v3
+      - uses: abrown/install-openvino-action@50a2ab733ef4b504dd7de3ac45c36eae7f9bc228
+        with:
+          version: 2022.3.0
+          apt: true
       - run: ./ci/run-wasi-nn-example.sh
         env:
           RUST_BACKTRACE: 1