wasi-nn: reenable CI task (bytecodealliance#7164)

The task was disabled due to a failing checksum. Since then, the
`install-openvino-action` has improved and now _almost_ has
cross-platform support. This change just restores the status quo in
expectation that bytecodealliance#6895 will significantly improve the testing story.

prtest:full

.github/workflows/main.yml

@@ -493,7 +493,7 @@ jobs:
           submodules: true
       - uses: ./.github/actions/install-rust
       - run: rustup target add wasm32-wasi
-      - uses: abrown/install-openvino-action@v6
+      - uses: abrown/install-openvino-action@v7
         with:
           version: 2022.3.0
           apt: true