Update module google.golang.org/grpc to v1.68.0 (#1163)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

go.mod

@@ -1,6 +1,8 @@
 module github.com/giantswarm/chart-operator/v3
 
-go 1.19
+go 1.22.7
+
+toolchain go1.23.3
 
 require (
 	github.com/giantswarm/apiextensions-application v0.6.0
@@ -145,16 +147,16 @@ require (
 	go.uber.org/multierr v1.11.0 // indirect
 	golang.org/x/crypto v0.28.0 // indirect
 	golang.org/x/exp v0.0.0-20231108232855-2478ac86f678 // indirect
-	golang.org/x/net v0.26.0 // indirect
-	golang.org/x/oauth2 v0.21.0 // indirect
+	golang.org/x/net v0.29.0 // indirect
+	golang.org/x/oauth2 v0.23.0 // indirect
 	golang.org/x/sync v0.8.0 // indirect
 	golang.org/x/sys v0.26.0 // indirect
 	golang.org/x/term v0.25.0 // indirect
 	golang.org/x/text v0.19.0 // indirect
 	golang.org/x/time v0.5.0 // indirect
 	gomodules.xyz/jsonpatch/v2 v2.2.0 // indirect
-	google.golang.org/genproto/googleapis/rpc v0.0.0-20240318140521-94a12d6c2237 // indirect
-	google.golang.org/grpc v1.62.1 // indirect
+	google.golang.org/genproto/googleapis/rpc v0.0.0-20240903143218-8af14fe29dc1 // indirect
+	google.golang.org/grpc v1.66.0 // indirect
 	google.golang.org/protobuf v1.34.2 // indirect
 	gopkg.in/inf.v0 v0.9.1 // indirect
 	gopkg.in/ini.v1 v1.67.0 // indirect
@@ -182,7 +184,7 @@ replace (
 	github.com/imdario/mergo => github.com/imdario/mergo v0.3.13
 	github.com/nats-io/nats-server/v2 => github.com/nats-io/nats-server/v2 v2.10.16
 	golang.org/x/net => golang.org/x/net v0.30.0
-	google.golang.org/grpc => google.golang.org/grpc v1.64.0
+	google.golang.org/grpc => google.golang.org/grpc v1.68.0
 )
 
 replace google.golang.org/protobuf v1.32.0 => google.golang.org/protobuf v1.33.0