Resolve "Update to Angular 12"

angular.json

package-lock.json

package.json

projects/kypo2-topology-graph-model/package.json

projects/kypo2-topology-graph-model/src/test.ts

projects/kypo2-topology-graph-model/tsconfig.lib.prod.json

src/environments/environment.ts

src/polyfills.ts

src/test.ts