fix: make updated npm version more accurate in action logs

The current log message "Update npm to latest" is not accurate
because npm can be updated to v9 or v10.

E.g. https://github.com/ybiquitous/.github/actions/runs/12461745399/job/34781727243

.github/workflows/nodejs-test-reusable.yml

@@ -44,21 +44,28 @@ jobs:
           node-version: ${{ inputs.node-version }}
           cache: npm
 
-      - name: Update npm to latest
+      - name: Get npm version
+        id: npm-version
         shell: bash
         run: |
           case $(node -v) in
             v16.*|v14.*|v12.*|v10.*)
-              npm install --global npm@9
+              npm_version=9
               ;;
             v18.*)
-              npm install --global npm@10
+              npm_version=10
               ;;
             *)
-              npm install --global npm@latest
+              npm_version=latest
               ;;
           esac
-          echo "Successfully updated npm to $(npm -v)"
+          echo "version=${npm_version}" >> "${GITHUB_OUTPUT}"
+
+      - name: Update npm to ${{ steps.npm-version.outputs.version }}
+        shell: bash
+        env:
+          npm_version: ${{ steps.npm-version.outputs.version }}
+        run: npm install --global "npm@${npm_version}"
 
       - name: Install dependencies
         run: npm ci