rebase: bump google.golang.org/grpc from 1.45.0 to 1.46.0

Bumps [google.golang.org/grpc](https://github.com/grpc/grpc-go) from 1.45.0 to 1.46.0.
- [Release notes](https://github.com/grpc/grpc-go/releases)
- [Commits](https://github.com/grpc/grpc-go/compare/v1.45.0...v1.46.0)

---
updated-dependencies:
- dependency-name: google.golang.org/grpc
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

vendor/modules.txt

@@ -639,7 +639,7 @@ google.golang.org/appengine/urlfetch
 google.golang.org/genproto/googleapis/api/httpbody
 google.golang.org/genproto/googleapis/rpc/status
 google.golang.org/genproto/protobuf/field_mask
-# google.golang.org/grpc v1.45.0
+# google.golang.org/grpc v1.46.0
 ## explicit; go 1.14
 google.golang.org/grpc
 google.golang.org/grpc/attributes
@@ -649,6 +649,7 @@ google.golang.org/grpc/balancer/base
 google.golang.org/grpc/balancer/grpclb/state
 google.golang.org/grpc/balancer/roundrobin
 google.golang.org/grpc/binarylog/grpc_binarylog_v1
+google.golang.org/grpc/channelz
 google.golang.org/grpc/codes
 google.golang.org/grpc/connectivity
 google.golang.org/grpc/credentials
@@ -661,6 +662,7 @@ google.golang.org/grpc/health
 google.golang.org/grpc/health/grpc_health_v1
 google.golang.org/grpc/internal
 google.golang.org/grpc/internal/backoff
+google.golang.org/grpc/internal/balancer/gracefulswitch
 google.golang.org/grpc/internal/balancerload
 google.golang.org/grpc/internal/binarylog
 google.golang.org/grpc/internal/buffer
@@ -672,6 +674,7 @@ google.golang.org/grpc/internal/grpcrand
 google.golang.org/grpc/internal/grpcsync
 google.golang.org/grpc/internal/grpcutil
 google.golang.org/grpc/internal/metadata
+google.golang.org/grpc/internal/pretty
 google.golang.org/grpc/internal/resolver
 google.golang.org/grpc/internal/resolver/dns
 google.golang.org/grpc/internal/resolver/passthrough