fix(ci): pin nx to 15.9.6 for Node.js v14 (#4124)

Author: pichlermarc

.github/workflows/unit-test.yml

@@ -46,6 +46,10 @@ jobs:
             experimental/packages/*/package-lock.json
           key: node-tests-${{ runner.os }}-${{ matrix.node_version }}-${{ hashFiles('package.json', 'packages/*/package.json', 'experimental/packages/*/package.json') }}-04292022
 
+      # temporary fix for https://github.com/nrwl/nx/issues/19022
+      - run: npm install --save-dev nx@16.7.4 @nx/devkit@16.7.4
+        if: ${{ matrix.node_version == '14' }}
+
       - name: Bootstrap
         run: |
           npm install --ignore-scripts