Bump github.com/palantir/go-githubapp from 0.27.0 to 0.28.0

Bumps [github.com/palantir/go-githubapp](https://github.com/palantir/go-githubapp) from 0.27.0 to 0.28.0.
- [Release notes](https://github.com/palantir/go-githubapp/releases)
- [Commits](palantir/go-githubapp@v0.27.0...v0.28.0)

---
updated-dependencies:
- dependency-name: github.com/palantir/go-githubapp
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

go.mod

@@ -13,7 +13,7 @@ require (
 	github.com/gregjones/httpcache v0.0.0-20190611155906-901d90724c79
 	github.com/hashicorp/golang-lru v1.0.2
 	github.com/palantir/go-baseapp v0.5.2
-	github.com/palantir/go-githubapp v0.27.0
+	github.com/palantir/go-githubapp v0.28.0
 	github.com/pkg/errors v0.9.1
 	github.com/rcrowley/go-metrics v0.0.0-20201227073835-cf1acfcdf475
 	github.com/rs/zerolog v1.33.0
@@ -35,6 +35,7 @@ require (
 	github.com/golang-jwt/jwt/v4 v4.5.0 // indirect
 	github.com/golang/protobuf v1.5.3 // indirect
 	github.com/google/go-github/v62 v62.0.0 // indirect
+	github.com/google/go-github/v64 v64.0.0 // indirect
 	github.com/inconshreveable/mousetrap v1.1.0 // indirect
 	github.com/kr/text v0.2.0 // indirect
 	github.com/mattn/go-colorable v0.1.13 // indirect

go.sum

@@ -43,6 +43,8 @@ github.com/google/go-github/v62 v62.0.0 h1:/6mGCaRywZz9MuHyw9gD1CwsbmBX8GWsbFkwM
 github.com/google/go-github/v62 v62.0.0/go.mod h1:EMxeUqGJq2xRu9DYBMwel/mr7kZrzUOfQmmpYrZn2a4=
 github.com/google/go-github/v63 v63.0.0 h1:13xwK/wk9alSokujB9lJkuzdmQuVn2QCPeck76wR3nE=
 github.com/google/go-github/v63 v63.0.0/go.mod h1:IqbcrgUmIcEaioWrGYei/09o+ge5vhffGOcxrO0AfmA=
+github.com/google/go-github/v64 v64.0.0 h1:4G61sozmY3eiPAjjoOHponXDBONm+utovTKbyUb2Qdg=
+github.com/google/go-github/v64 v64.0.0/go.mod h1:xB3vqMQNdHzilXBiO2I+M7iEFtHf+DP/omBOv6tQzVo=
 github.com/google/go-querystring v1.1.0 h1:AnCroh3fv4ZBgVIf1Iwtovgjaw/GiKJo8M8yD/fhyJ8=
 github.com/google/go-querystring v1.1.0/go.mod h1:Kcdr2DB4koayq7X8pmAG4sNG59So17icRSOU623lUBU=
 github.com/gregjones/httpcache v0.0.0-20190611155906-901d90724c79 h1:+ngKgrYPPJrOjhax5N+uePQ0Fh1Z7PheYoUI/0nzkPA=
@@ -67,8 +69,8 @@ github.com/matttproud/golang_protobuf_extensions v1.0.4 h1:mmDVorXM7PCGKw94cs5zk
 github.com/matttproud/golang_protobuf_extensions v1.0.4/go.mod h1:BSXmuO+STAnVfrANrmjBb36TMTDstsz7MSK+HVaYKv4=
 github.com/palantir/go-baseapp v0.5.2 h1:b1ukx7AXo2/E4NkUvTFlW+185uwCcifzd2XzLrG4oS8=
 github.com/palantir/go-baseapp v0.5.2/go.mod h1:uijQMPfmgV69oiMu2jkskum/4HiYuEP/gzrnphD+/Co=
-github.com/palantir/go-githubapp v0.27.0 h1:YTSnLElOVOSSFOqCiAyc1wpZMQjGmMvjas0W/F9W4Jk=
-github.com/palantir/go-githubapp v0.27.0/go.mod h1:yi9WLdjHkIfeZMetaZyCFJLcxocmrYdd+e5BJTfkimI=
+github.com/palantir/go-githubapp v0.28.0 h1:UpT7kbz51MTC0Mq+dDCPVm4YYHKHmLL4zFcNlPGLgCM=
+github.com/palantir/go-githubapp v0.28.0/go.mod h1:Jdn/gIVi4fOgJei5D7a5Quk3EmCgiaJ9Wzbv/EMmLSE=
 github.com/patrickmn/go-cache v2.1.0+incompatible h1:HRMgzkcYKYpi3C8ajMPV8OFXaaRUnok+kx1WdO15EQc=
 github.com/patrickmn/go-cache v2.1.0+incompatible/go.mod h1:3Qf8kWWT7OJRJbdiICTKqZju1ZixQ/KpMGzzAfe6+WQ=
 github.com/pkg/errors v0.9.1 h1:FEBLx1zS214owpjy7qsBeixbURkuhQAwrK5UwLGTwt4=