Include 4.6 in the TS test matrix

Author: lukpsaxo

.github/workflows/build-and-test-types.yml

@@ -48,7 +48,7 @@ jobs:
       fail-fast: false
       matrix:
         node: ['14.x']
-        ts: ['4.2', '4.3', '4.4', '4.5', 'next']
+        ts: ['4.2', '4.3', '4.4', '4.5', '4.6', 'next']
     steps:
       - name: Checkout repo
         uses: actions/checkout@v2