Added node 16 testing (#513)

* removed node 12; added node 16, 18, 20

* removed unreleased versions

* added node 12 back

Author: willarmiros

.github/workflows/pr-build.yml

@@ -19,10 +19,10 @@ jobs:
         node-version:
           - 12.x
           - 14.x
-          - 15.x
+          - 16.x
         include:
           - os: ubuntu-latest
-            node-version: 14.x
+            node-version: 16.x
             coverage: true
     steps:
       - name: Checkout AWS XRay SDK Node Repository @ default branch latest
@@ -72,7 +72,7 @@ jobs:
       - name: Setup Node
         uses: actions/setup-node@v1
         with:
-          node-version: 14.x
+          node-version: 16.x
 
       - name: Cache NPM modules
         uses: actions/cache@v2

.github/workflows/release.yml

@@ -19,7 +19,7 @@ jobs:
       - name: Setup Node
         uses: actions/setup-node@v1
         with:
-          node-version: '14.x'
+          node-version: '16.x'
           registry-url: 'https://registry.npmjs.org'
 
       - name: Cache NPM modules

.github/workflows/smoke-test.yml

@@ -15,7 +15,7 @@ jobs:
       - name: Setup Node
         uses: actions/setup-node@v1
         with:
-          node-version: '14.x'
+          node-version: '16.x'
 
       # Use npm pack to bundle individual packages into their final distribution tarball form
       # Then aggregate all of those tarballs in the full_sdk package, to be used by smoke test