fix: update vulnerable gRPC and demo dependencies

Author: stefan-ernst

go.mod

@@ -202,7 +202,7 @@ require (
 	golang.org/x/tools v0.48.0 // indirect
 	google.golang.org/api v0.291.0 // indirect
 	google.golang.org/genproto/googleapis/rpc v0.0.0-20260729162451-8efbd57d26e0 // indirect
-	google.golang.org/grpc v1.83.0 // indirect
+	google.golang.org/grpc v1.83.1 // indirect
 	google.golang.org/protobuf v1.36.11 // indirect
 	modernc.org/libc v1.67.6 // indirect
 	modernc.org/mathutil v1.7.1 // indirect

go.sum

@@ -586,8 +586,8 @@ google.golang.org/genproto/googleapis/api v0.0.0-20260729162451-8efbd57d26e0 h1:
 google.golang.org/genproto/googleapis/api v0.0.0-20260729162451-8efbd57d26e0/go.mod h1:HJ9MpJLeDSstBkx1LILTpd5f41ADSMZcTPypw02qEGw=
 google.golang.org/genproto/googleapis/rpc v0.0.0-20260729162451-8efbd57d26e0 h1:mJiOtnGp0k/BcSgdu03G2NwnscCfCH+h2QKUBZr18KI=
 google.golang.org/genproto/googleapis/rpc v0.0.0-20260729162451-8efbd57d26e0/go.mod h1:4Hqkh8ycfw05ld/3BWL7rJOSfebL2Q+DVDeRgYgxUU8=
-google.golang.org/grpc v1.83.0 h1:JeNZEKJFbQxArAMl+hiytHauacDNqJUllNfmIMmpqnQ=
-google.golang.org/grpc v1.83.0/go.mod h1:kDyl6SKsiHKt0uylY5gtn5cEjkrIOhQOGDgIc4JGwzQ=
+google.golang.org/grpc v1.83.1 h1:HIO0+BEtBP6soyqvqC8sNUjZ7bTs+0hFQuFF+RAy++Y=
+google.golang.org/grpc v1.83.1/go.mod h1:kDyl6SKsiHKt0uylY5gtn5cEjkrIOhQOGDgIc4JGwzQ=
 google.golang.org/protobuf v1.36.11 h1:fV6ZwhNocDyBLK0dj+fg8ektcVegBBuEolpbTQyBNVE=
 google.golang.org/protobuf v1.36.11/go.mod h1:HTf+CrKn2C3g5S8VImy6tdcUvCska2kB7j23XfzDpco=
 gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=