Bump prometheus/common to v0.55.0

Signed-off-by: Davanum Srinivas <davanum@gmail.com>

vendor/google.golang.org/protobuf/proto/decode.go

@@ -51,6 +51,8 @@ type UnmarshalOptions struct {
 
 // Unmarshal parses the wire-format message in b and places the result in m.
 // The provided message must be mutable (e.g., a non-nil pointer to a message).
+//
+// See the [UnmarshalOptions] type if you need more control.
 func Unmarshal(b []byte, m Message) error {
 	_, err := UnmarshalOptions{RecursionLimit: protowire.DefaultRecursionLimit}.unmarshal(b, m.ProtoReflect())
 	return err