Upgrade to Node 14 for Actions (#2928)

Summary:
I believe that matches what we have internally. This has been causing some upgrades to fail.

Pull Request resolved: https://github.com/facebook/flipper/pull/2928

Reviewed By: aigoncharov

Differential Revision: D31324394

Pulled By: passy

fbshipit-source-id: eec38dcc6322e3e8957bbc20bf74d343855be8c0

.github/workflows/release.yml

@@ -56,7 +56,7 @@ jobs:
         ref: ${{ needs.release.outputs.tag }}
     - uses: actions/setup-node@v1
       with:
-        node-version: '12.x'
+        node-version: '14.x'
     - name: Install
       uses: nick-invision/retry@v2.0.0
       with:
@@ -88,7 +88,7 @@ jobs:
         ref: ${{ needs.release.outputs.tag }}
     - uses: actions/setup-node@v1
       with:
-        node-version: '12.x'
+        node-version: '14.x'
     - name: Install
       uses: nick-invision/retry@v2.0.0
       with:
@@ -120,7 +120,7 @@ jobs:
         ref: ${{ needs.release.outputs.tag }}
     - uses: actions/setup-node@v1
       with:
-        node-version: '12.x'
+        node-version: '14.x'
     - name: Install
       uses: nick-invision/retry@v2.0.0
       with: