Update dependency ts-loader to v9.5.4

Author: renovate[bot]

package-lock.json

@@ -71,7 +71,7 @@
     "rimraf": "3.0.2",
     "supertest": "6.1.3",
     "ts-jest": "26.5.6",
-    "ts-loader": "9.1.2",
+    "ts-loader": "9.5.4",
     "ts-node": "9.1.1",
     "tsconfig-paths": "3.9.0",
     "tslint": "6.1.3",