chore(deps): update dependency @grpc/proto-loader to v0.7.15

Author: renovate[bot]

package-lock.json

@@ -52,7 +52,7 @@
   },
   "devDependencies": {
     "@grpc/grpc-js": "1.12.4",
-    "@grpc/proto-loader": "0.7.13",
+    "@grpc/proto-loader": "0.7.15",
     "@pact-foundation/pact-js-prettier-config": "1.0.0",
     "@snyk/protect": "1.1294.2",
     "@tsconfig/node14": "14.1.2",