Drop support for Node v12.

Add v18 to test matrix

.github/workflows/backend-tests.yml

@@ -18,7 +18,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        node: [12, 14, 16]
+        node: [14, 16, 18]
     steps:
       -
         name: Checkout repository
@@ -55,7 +55,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        node: [12, 14, 16]
+        node: [14, 16, 18]
     steps:
       -
         name: Checkout repository
@@ -124,7 +124,7 @@ jobs:
       -
         uses: actions/setup-node@v3
         with:
-          node-version: 12
+          node-version: 14
           cache: 'npm'
           cache-dependency-path: |
             src/package-lock.json
@@ -157,7 +157,7 @@ jobs:
       -
         uses: actions/setup-node@v3
         with:
-          node-version: 12
+          node-version: 14
           cache: 'npm'
           cache-dependency-path: |
             src/package-lock.json

.github/workflows/frontend-admin-tests.yml

@@ -11,7 +11,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        node: [12, 14, 16]
+        node: [14, 16, 18]
 
     steps:
       -

.github/workflows/frontend-tests.yml

@@ -31,7 +31,7 @@ jobs:
       -
         uses: actions/setup-node@v3
         with:
-          node-version: 12
+          node-version: 14
           cache: 'npm'
           cache-dependency-path: |
             src/package-lock.json
@@ -95,7 +95,7 @@ jobs:
       -
         uses: actions/setup-node@v3
         with:
-          node-version: 12
+          node-version: 14
           cache: 'npm'
           cache-dependency-path: |
             src/package-lock.json

.github/workflows/lint-package-lock.yml

@@ -22,7 +22,7 @@ jobs:
       -
         uses: actions/setup-node@v3
         with:
-          node-version: 12
+          node-version: 14
           cache: 'npm'
           cache-dependency-path: |
             src/package-lock.json

.github/workflows/load-test.yml

@@ -22,7 +22,7 @@ jobs:
       -
         uses: actions/setup-node@v3
         with:
-          node-version: 12
+          node-version: 14
           cache: 'npm'
           cache-dependency-path: |
             src/package-lock.json
@@ -52,7 +52,7 @@ jobs:
       -
         uses: actions/setup-node@v3
         with:
-          node-version: 12
+          node-version: 14
           cache: 'npm'
           cache-dependency-path: |
             src/package-lock.json
@@ -109,7 +109,7 @@ jobs:
       -
         uses: actions/setup-node@v3
         with:
-          node-version: 12
+          node-version: 14
           cache: 'npm'
           cache-dependency-path: |
             src/package-lock.json

.github/workflows/rate-limit.yml

@@ -22,7 +22,7 @@ jobs:
       -
         uses: actions/setup-node@v3
         with:
-          node-version: 12
+          node-version: 14
           cache: 'npm'
           cache-dependency-path: |
             src/package-lock.json

.github/workflows/upgrade-from-latest-release.yml

@@ -18,7 +18,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        node: [12, 14, 16]
+        node: [14, 16, 18]
     steps:
       -
         name: Check out latest release

.github/workflows/windows.yml

@@ -28,7 +28,7 @@ jobs:
       -
         uses: actions/setup-node@v3
         with:
-          node-version: 12
+          node-version: 14
           cache: 'npm'
           cache-dependency-path: |
             src/package-lock.json
@@ -108,7 +108,7 @@ jobs:
       -
         uses: actions/setup-node@v3
         with:
-          node-version: 12
+          node-version: 14
           cache: 'npm'
           cache-dependency-path: |
             etherpad/src/package-lock.json