Use strict versions in package.json and align CI (#420)

With `^` it means that we can get any version up to the latest minor or patch version. For example "prettier": "^2.8.3" it means at least 2.8.3 but anything before to 3.0.0, with this change we get the exact same version all the time.

The CI now reads package.json to get the same version of prettier to run.

Author: lucacome

.github/workflows/lint.yml

@@ -44,15 +44,19 @@ jobs:
     steps:
       - name: Checkout Repository
         uses: actions/checkout@ac593985615ec2ede58e132d2e21d2b1cbd6127c # v2.5.0
+      - name: Get Prettier version
+        id: prettier-version
+        run: |
+          echo "version=$(jq -r .devDependencies.prettier ${{ github.workspace }}/internal/nginx/modules/package.json)" >> $GITHUB_OUTPUT
       - name: Run Prettier on NJS code
         id: prettier-run
         uses: rutajdash/prettier-cli-action@30325c923a7b131ab8b6c99e0aff38afaddb9643 # v1.0.0
         with:
           config_path: ${{ github.workspace }}/internal/nginx/modules/.prettierrc
           file_pattern: ${{ github.workspace }}/internal/nginx/modules/**/*.js
-          prettier_version: 2.6.2
+          prettier_version: ${{ steps.prettier-version.outputs.version }}
       - name: Prettier Output
-        if: ${{ failure() }}
+        if: failure()
         shell: bash
         run: |
           echo "The following files are not formatted:"