chore(deps): update dependency @grpc/proto-loader to ^0.7.0 (#1455)

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This PR contains the following updates:

| Package | Change | Age | Adoption | Passing | Confidence |
|---|---|---|---|---|---|
| [@grpc/proto-loader](https://grpc.io/) ([source](https://togithub.com/grpc/grpc-node)) | [`^0.6.0` -> `^0.7.0`](https://renovatebot.com/diffs/npm/@grpc%2fproto-loader/0.6.13/0.7.0) | [![age](https://badges.renovateapi.com/packages/npm/@grpc%2fproto-loader/0.7.0/age-slim)](https://docs.renovatebot.com/merge-confidence/) | [![adoption](https://badges.renovateapi.com/packages/npm/@grpc%2fproto-loader/0.7.0/adoption-slim)](https://docs.renovatebot.com/merge-confidence/) | [![passing](https://badges.renovateapi.com/packages/npm/@grpc%2fproto-loader/0.7.0/compatibility-slim/0.6.13)](https://docs.renovatebot.com/merge-confidence/) | [![confidence](https://badges.renovateapi.com/packages/npm/@grpc%2fproto-loader/0.7.0/confidence-slim/0.6.13)](https://docs.renovatebot.com/merge-confidence/) |

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package.json

@@ -50,7 +50,7 @@
   "devDependencies": {
     "@compodoc/compodoc": "1.1.18",
     "@google-cloud/datastore": "^7.0.0",
-    "@grpc/proto-loader": "^0.6.0",
+    "@grpc/proto-loader": "^0.7.0",
     "@types/builtin-modules": "^2.0.0",
     "@types/console-log-level": "^1.4.0",
     "@types/continuation-local-storage": "^3.2.1",