Update wasmtime version in CI

This commit updates the wasmtime version used in CI, which is currently
a very outdated version. The new version matches the version used in the
CLI.

Additionally, this commit introduces a mechanism to retrieve the CLI
from a `wasmtime-version` file located at the root of the repository, in
order to make it a bit easier to update the version in the future.

.github/actions/ci-shared-setup/action.yml

@@ -25,12 +25,16 @@ runs:
           ${{ runner.os }}-cargo-target-${{ hashFiles('Cargo.toml') }}
           ${{ runner.os }}-cargo-target
 
+    - name: Read wasmtime version
+      id: wasmtime_version
+      run: |
+        VERSION=$(cat wasmtime-version)
+        echo "::set-output name=wasmtime_version::$VERSION"
+
     - name: Install wasmtime-cli
-      env:
-        WASMTIME_VERSION: 8.0.0
       shell: bash
       run: |
-        wget -nv 'https://github.com/bytecodealliance/wasmtime/releases/download/v${{ env.WASMTIME_VERSION }}/wasmtime-v${{ env.WASMTIME_VERSION }}-x86_64-${{ inputs.os }}.tar.xz' -O /tmp/wasmtime.tar.xz
+        wget -nv 'https://github.com/bytecodealliance/wasmtime/releases/download/v${{ steps.wasmtime_version.outputs.wasmtime_version }}/wasmtime-v${{ steps.wasmtime_version.outputs.wasmtime_version }}-x86_64-${{ inputs.os }}.tar.xz' -O /tmp/wasmtime.tar.xz
         mkdir /tmp/wasmtime
         tar xvf /tmp/wasmtime.tar.xz --strip-components=1 -C /tmp/wasmtime
         echo "/tmp/wasmtime" >> $GITHUB_PATH

wasmtime-version

@@ -0,0 +1 @@
+19.0.0