Bump @grpc/grpc-js from 1.9.7 to 1.9.15

Bumps [@grpc/grpc-js](https://github.com/grpc/grpc-node) from 1.9.7 to 1.9.15.
- [Release notes](https://github.com/grpc/grpc-node/releases)
- [Commits](https://github.com/grpc/grpc-node/compare/@grpc/grpc-js@1.9.7...@grpc/grpc-js@1.9.15)

---
updated-dependencies:
- dependency-name: "@grpc/grpc-js"
  dependency-type: indirect
...

Signed-off-by: dependabot[bot] <support@github.com>

yarn.lock

@@ -1487,9 +1487,9 @@
   integrity sha512-59SgoZ3EXbkfSX7b63tsou/SDGzwUEK6MuB5sKqgVK1/XE0fxmpsOb9DQI8LXW3KfGnAjImCGhhEb7uPPAUVNA==
 
 "@grpc/grpc-js@~1.9.0":
-  version "1.9.7"
-  resolved "https://registry.npmjs.org/@grpc/grpc-js/-/grpc-js-1.9.7.tgz"
-  integrity sha512-yMaA/cIsRhGzW3ymCNpdlPcInXcovztlgu/rirThj2b87u3RzWUszliOqZ/pldy7yhmJPS8uwog+kZSTa4A0PQ==
+  version "1.9.15"
+  resolved "https://registry.yarnpkg.com/@grpc/grpc-js/-/grpc-js-1.9.15.tgz#433d7ac19b1754af690ea650ab72190bd700739b"
+  integrity sha512-nqE7Hc0AzI+euzUwDAy0aY5hCp10r734gMGRdU+qOPX0XSceI2ULrcXB5U2xSc5VkWwalCj4M7GzCAygZl2KoQ==
   dependencies:
     "@grpc/proto-loader" "^0.7.8"
     "@types/node" ">=12.12.47"