Update CI node.js versions to 20.x (#8055)

Upgrade our CI scripts and workflows to work in Node 20.x:
 - Updated workflows to use node 20.x across the board
 - Updated tests which use the emualtor to connect to '127.0.0.1' explicitly instead of 'localhost', since newer versions of `node` treat `localhost` differently depending on the executing OS. For instance, `localhost` might resolve to the IPv6 address `::1`, but that's not the address that the emulators bind to.
 - Updated `packages/rules-unit-testing/functions/package.json` `engines` directive to define `>=16` instead of requiring `16` explicitly.

Author: DellaBitta

.changeset/violet-ways-judge.md

@@ -0,0 +1,2 @@
+---
+---

.github/workflows/canary-deploy.yml

@@ -31,10 +31,10 @@ jobs:
       with:
         # Canary release script requires git history and tags.
         fetch-depth: 0
-    - name: Set up Node (16)
+    - name: Set up Node (20)
       uses: actions/setup-node@v3
       with:
-        node-version: 16.x
+        node-version: 20.x
     - name: Yarn install
       run: yarn
     - name: Deploy canary

.github/workflows/check-changeset.yml

@@ -34,10 +34,10 @@ jobs:
       with:
         # This makes Actions fetch all Git history so check_changeset script can diff properly.
         fetch-depth: 0
-    - name: Set up Node (16)
+    - name: Set up Node (20)
       uses: actions/setup-node@v3
       with:
-        node-version: 16.x
+        node-version: 20.x
     - name: Yarn install
       run: yarn
     - name: Run changeset script

.github/workflows/check-docs.yml

@@ -27,10 +27,10 @@ jobs:
       with:
         # get all history for the diff
         fetch-depth: 0
-    - name: Set up Node (16)
+    - name: Set up Node (20)
       uses: actions/setup-node@v3
       with:
-        node-version: 16.x
+        node-version: 20.x
     - name: Yarn install
       run: yarn
     - name: Run doc generation (devsite docs)

.github/workflows/check-pkg-paths.yml

@@ -27,10 +27,10 @@ jobs:
       with:
         # This makes Actions fetch all Git history so run-changed script can diff properly.
         fetch-depth: 0
-    - name: Set up Node (16)
+    - name: Set up Node (20)
       uses: actions/setup-node@v3
       with:
-        node-version: 16.x
+        node-version: 20.x
     - name: Yarn install
       run: yarn
     - name: Yarn build

.github/workflows/deploy-config.yml

@@ -34,10 +34,10 @@ jobs:
       with:
         # This makes Actions fetch all Git history so run-changed script can diff properly.
         fetch-depth: 0
-    - name: Set up node (18)
+    - name: Set up node (20)
       uses: actions/setup-node@v3
       with:
-        node-version: 18.x
+        node-version: 20.x
     - name: Yarn install
       run: yarn
     - name: Deploy project config if needed

.github/workflows/e2e-test.yml

@@ -36,10 +36,10 @@ jobs:
     steps:
       - name: Checkout Repo
         uses: actions/checkout@master
-      - name: Set up Node (18)
+      - name: Set up Node (20)
         uses: actions/setup-node@master
         with:
-          node-version: 18.x
+          node-version: 20.x
       - name: install Chrome stable
         run: |
           sudo apt-get update

.github/workflows/format.yml

@@ -31,10 +31,10 @@ jobs:
       with:
         # get all history for the diff
         fetch-depth: 0
-    - name: Set up node (16)
+    - name: Set up node (20)
       uses: actions/setup-node@v3
       with:
-        node-version: 16.x
+        node-version: 20.x
     - name: Yarn install
       run: yarn
     - name: Run formatting script

.github/workflows/health-metrics-pull-request.yml

@@ -41,7 +41,7 @@ jobs:
       - uses: actions/checkout@v3
       - uses: actions/setup-node@v3
         with:
-          node-version: 16.x
+          node-version: 20.x
       - uses: 'google-github-actions/auth@v0'
         with:
           credentials_json: '${{ secrets.GCP_SA_KEY }}'
@@ -58,7 +58,7 @@ jobs:
       - uses: actions/checkout@v3
       - uses: actions/setup-node@v3
         with:
-          node-version: 16.x
+          node-version: 20.x
       - uses: 'google-github-actions/auth@v0'
         with:
           credentials_json: '${{ secrets.GCP_SA_KEY }}'

.github/workflows/lint.yml

@@ -23,10 +23,10 @@ jobs:
 
     steps:
     - uses: actions/checkout@v3
-    - name: Set up node (16)
+    - name: Set up node (20)
       uses: actions/setup-node@v3
       with:
-        node-version: 16.x
+        node-version: 20.x
     - name: yarn install
       run: yarn
     - name: yarn lint