update node versions (#5354)

* format

* updating node ver

* updating version

* updating eth2 ver

* update for e2e and unit tetss

* revert mosaic ver change

* revert

* changing set up node ver

* update node set up ver

* updating actions cache for node14

Author: Alex

.github/workflows/build.yml

@@ -27,7 +27,6 @@ jobs:
             - uses: actions/setup-node@v1
               with:
                   node-version: 12
-
             - uses: actions/checkout@v2
 
             - uses: actions/cache@v2
@@ -36,7 +35,7 @@ jobs:
                   path: |
                       node_modules
                       */*/node_modules
-                  key: ${{ runner.os }}-node12-${{ hashFiles('**/package-lock.json') }}
+                  key: ${{ runner.os }}-node14-${{ hashFiles('**/package-lock.json') }}
 
             - run: npm ci
               if: steps.cache-deps.outputs.cache-hit != 'true'
@@ -46,7 +45,7 @@ jobs:
         runs-on: ubuntu-latest
         strategy:
             matrix:
-                node: [12, 14, 16]
+                node: [14, 16]
         env:
             TEST: "unit"
         steps:
@@ -87,7 +86,7 @@ jobs:
         steps:
             - uses: actions/setup-node@v1
               with:
-                  node-version: 12
+                  node-version: 14
             - uses: actions/checkout@v2
 
             - uses: actions/cache@v2
@@ -97,7 +96,7 @@ jobs:
                   path: |
                       node_modules
                       */*/node_modules
-                  key: ${{ runner.os }}-node12-${{ hashFiles('**/package-lock.json') }}
+                  key: ${{ runner.os }}-node14-${{ hashFiles('**/package-lock.json') }}
 
             - run: npm ci
               if: (env.TEST == 'unit_and_e2e_clients' || env.TEST == 'e2e_browsers') && steps.cache-deps.outputs.cache-hit != 'true'
@@ -125,7 +124,7 @@ jobs:
         runs-on: ubuntu-latest
         strategy:
             matrix:
-                node: [12, 14, 16]
+                node: [14, 16]
         env:
             TEST: "eth2"
         steps: