Bump github.com/grpc-ecosystem/grpc-gateway from 1.14.8 to 1.15.0 (#342)

Bumps [github.com/grpc-ecosystem/grpc-gateway](https:/grpc-ecosystem/grpc-gateway) from 1.14.8 to 1.15.0.
- [Release notes](https:/grpc-ecosystem/grpc-gateway/releases)
- [Changelog](https:/grpc-ecosystem/grpc-gateway/blob/master/CHANGELOG.md)
- [Commits](grpc-ecosystem/grpc-gateway@v1.14.8...v1.15.0)

Signed-off-by: dependabot-preview[bot] <[email protected]>

Co-authored-by: dependabot-preview[bot] <27856297+dependabot-preview[bot]@users.noreply.github.com>

go.mod

@@ -24,7 +24,7 @@ require (
  github.com/google/go-github/v32 v32.1.0
  github.com/grpc-ecosystem/go-grpc-middleware v1.2.2
  github.com/grpc-ecosystem/go-grpc-prometheus v1.2.0
- github.com/grpc-ecosystem/grpc-gateway v1.14.8
+ github.com/grpc-ecosystem/grpc-gateway v1.15.0
  github.com/kr/text v0.2.0 // indirect
  github.com/lib/pq v1.8.0
  github.com/luna-duclos/instrumentedsql v1.1.3

go.sum

@@ -178,6 +178,8 @@ github.com/grpc-ecosystem/grpc-gateway v1.14.7 h1:Nk5kuHrnWUTf/0GL1a/vchH/om9Ap2
 github.com/grpc-ecosystem/grpc-gateway v1.14.7/go.mod h1:oYZKL012gGh6LMyg/xA7Q2yq6j8bu0wa+9w14EEthWU=
 github.com/grpc-ecosystem/grpc-gateway v1.14.8 h1:hXClj+iFpmLM8i3lkO6i4Psli4P2qObQuQReiII26U8=
 github.com/grpc-ecosystem/grpc-gateway v1.14.8/go.mod h1:NZE8t6vs6TnwLL/ITkaK8W3ecMLGAbh2jXTclvpiwYo=
+github.com/grpc-ecosystem/grpc-gateway v1.15.0 h1:ntPNC9TD/6l2XDenJZe6T5lSMg95thpV9sGAqHX4WU8=
+github.com/grpc-ecosystem/grpc-gateway v1.15.0/go.mod h1:vO11I9oWA+KsxmfFQPhLnnIb1VDE24M+pdxZFiuZcA8=
 github.com/grpc-ecosystem/grpc-opentracing v0.0.0-20180507213350-8e809c8a8645/go.mod h1:6iZfnjpejD4L/4DwD7NryNaJyCQdzwWwH2MWhCA90Kw=
 github.com/hashicorp/consul/api v1.1.0/go.mod h1:VmuI/Lkw1nC05EYQWNKwWGbkg+FbDBtguAZLlVdkD9Q=
 github.com/hashicorp/consul/sdk v0.1.1/go.mod h1:VKf9jXwCTEY1QZP2MOLRhb5i/I/ssyNV1vwHyQBF0x8=