build: upgrade to go 1.17 and dependencies

vendor/github.com/golang/protobuf/proto/registry.go

@@ -13,6 +13,7 @@ import (
 	"strings"
 	"sync"
 
+	"google.golang.org/protobuf/reflect/protodesc"
 	"google.golang.org/protobuf/reflect/protoreflect"
 	"google.golang.org/protobuf/reflect/protoregistry"
 	"google.golang.org/protobuf/runtime/protoimpl"
@@ -62,14 +63,7 @@ func FileDescriptor(s filePath) fileDescGZIP {
 	// Find the descriptor in the v2 registry.
 	var b []byte
 	if fd, _ := protoregistry.GlobalFiles.FindFileByPath(s); fd != nil {
-		if fd, ok := fd.(interface{ ProtoLegacyRawDesc() []byte }); ok {
-			b = fd.ProtoLegacyRawDesc()
-		} else {
-			// TODO: Use protodesc.ToFileDescriptorProto to construct
-			// a descriptorpb.FileDescriptorProto and marshal it.
-			// However, doing so causes the proto package to have a dependency
-			// on descriptorpb, leading to cyclic dependency issues.
-		}
+		b, _ = Marshal(protodesc.ToFileDescriptorProto(fd))
 	}
 
 	// Locally cache the raw descriptor form for the file.

vendor/github.com/golang/protobuf/proto/text_decode.go

@@ -765,7 +765,7 @@ func unescape(s string) (ch string, tail string, err error) {
 		if i > utf8.MaxRune {
 			return "", "", fmt.Errorf(`\%c%s is not a valid Unicode code point`, r, ss)
 		}
-		return string(i), s, nil
+		return string(rune(i)), s, nil
 	}
 	return "", "", fmt.Errorf(`unknown escape \%c`, r)
 }