chore(deps): upgrade grpc-js to 1.12.7 (#4707)

`@grpc/grpc-js` sat at 1.12.6 in the lockfile. `dockerode` is the only
consumer and already declares `^1.11.1`, so a scoped override is enough:

```json
"@grpc/grpc-js@>=1.12.0 <1.12.7": "1.12.7"
```

Pinned exactly to stay on the 1.12 line; a caret would pull 1.14.x.

package.json

@@ -123,6 +123,7 @@
       "picomatch@>=4 <4.0.4": "^4.0.4",
       "minimatch@>=3 <3.1.3": "^3.1.3",
       "protobufjs@>=7 <7.6.5": "^7.6.5",
+      "@grpc/grpc-js@>=1.12.0 <1.12.7": "1.12.7",
       "fast-xml-parser@>=4 <4.5.5": "^4.5.5",
       "fast-xml-parser@>=5 <5.7.0": "^5.7.0",
       "path-to-regexp@>=0.1 <0.1.13": "^0.1.13",