build: update test related packages

- Replace deprecated mocha-typescript with @testdeck/mocha
- Update other test related packages to their latest versions

See !41

package.json

@@ -46,7 +46,7 @@
     "got": "9.6.0",
     "moment": "2.24.0",
     "morgan": "1.9.1",
-    "nock": "10.0.6",
+    "nock": "13.0.4",
     "node-cache": "4.2.0",
     "node-cron": "2.0.3",
     "nodemailer": "6.2.1",
@@ -57,36 +57,37 @@
   },
   "devDependencies": {
     "@openstapps/configuration": "0.25.0",
-    "@types/chai": "4.1.7",
-    "@types/chai-as-promised": "7.1.0",
+    "@testdeck/mocha": "0.1.2",
+    "@types/chai": "4.2.14",
+    "@types/chai-as-promised": "7.1.3",
     "@types/config": "0.0.34",
     "@types/cors": "2.8.5",
     "@types/elasticsearch": "5.0.35",
     "@types/express": "4.17.0",
     "@types/fs-extra": "7.0.0",
     "@types/got": "9.4.4",
+    "@types/mocha": "8.0.3",
     "@types/morgan": "1.7.35",
     "@types/nock": "10.0.3",
     "@types/node-cache": "4.1.3",
     "@types/node-cron": "2.0.2",
     "@types/nodemailer": "6.2.0",
     "@types/promise-queue": "2.2.0",
-    "@types/sinon-express-mock": "1.3.7",
-    "@types/supertest": "2.0.7",
+    "@types/sinon-express-mock": "1.3.9",
+    "@types/supertest": "2.0.10",
     "@types/uuid": "3.4.5",
     "chai": "4.2.0",
     "chai-as-promised": "7.1.1",
     "conventional-changelog-cli": "2.0.21",
     "get-port": "5.1.1",
-    "mocha": "6.1.4",
-    "mocha-typescript": "1.1.17",
+    "mocha": "8.2.1",
     "mocked-env": "1.3.2",
-    "nyc": "14.1.1",
+    "nyc": "15.1.0",
     "prepend-file-cli": "1.0.6",
     "rimraf": "2.6.3",
-    "sinon": "7.3.2",
-    "sinon-express-mock": "2.2.0",
-    "supertest": "4.0.2",
+    "sinon": "9.2.1",
+    "sinon-express-mock": "2.2.1",
+    "supertest": "6.0.0",
     "tslint": "6.1.3",
     "typedoc": "0.18.0",
     "typescript": "3.8.3"