Upgrade Typescript to 4.3

Also necessitated upgrading ts-jest to 27.0 and jest to 26.0

.licenses/npm/@actions/core.dep.yml

@@ -2,8 +2,8 @@
 name: "@actions/core"
 version: 1.2.4
 type: npm
-summary: Actions core lib
-homepage: https://github.com/actions/toolkit/tree/master/packages/core
+summary: 
+homepage: 
 license: mit
 licenses:
 - sources: Auto-generated MIT license text

.licenses/npm/js-yaml.dep.yml

@@ -2,8 +2,8 @@
 name: js-yaml
 version: 3.13.1
 type: npm
-summary: YAML 1.2 parser and serializer
-homepage: https://github.com/nodeca/js-yaml
+summary: 
+homepage: 
 license: mit
 licenses:
 - sources: LICENSE