fix(@schematics/schematics): generate new schematics using TypeScript 3.9

Author: alan-agius4

packages/schematics/schematics/blank/project-files/package.json.template

@@ -15,7 +15,7 @@
   "dependencies": {
     "@angular-devkit/core": "^<%= coreVersion %>",
     "@angular-devkit/schematics": "^<%= schematicsVersion %>",
-    "typescript": "~3.9.2"
+    "typescript": "~3.9.7"
   },
   "devDependencies": {
     "@types/node": "^12.11.1",

packages/schematics/schematics/schematic/files/package.json

@@ -15,7 +15,7 @@
   "dependencies": {
     "@angular-devkit/core": "^<%= coreVersion %>",
     "@angular-devkit/schematics": "^<%= schematicsVersion %>",
-    "typescript": "~3.8.2"
+    "typescript": "~3.9.7"
   },
   "devDependencies": {
     "@types/node": "^12.11.1",