use the slices package to simply QUIC version comparisons (#5130)

No functional change expected.

internal/protocol/version.go

@@ -6,6 +6,7 @@ import (
 	"fmt"
 	"math"
 	mrand "math/rand/v2"
+	"slices"
 	"sync"
 )
 
@@ -64,12 +65,7 @@ func (vn Version) toGQUICVersion() int {
 
 // IsSupportedVersion returns true if the server supports this version
 func IsSupportedVersion(supported []Version, v Version) bool {
-	for _, t := range supported {
-		if t == v {
-			return true
-		}
-	}
-	return false
+	return slices.Contains(supported, v)
 }
 
 // ChooseSupportedVersion finds the best version in the overlap of ours and theirs
@@ -78,10 +74,8 @@ func IsSupportedVersion(supported []Version, v Version) bool {
 // The bool returned indicates if a matching version was found.
 func ChooseSupportedVersion(ours, theirs []Version) (Version, bool) {
 	for _, ourVer := range ours {
-		for _, theirVer := range theirs {
-			if ourVer == theirVer {
-				return ourVer, true
-			}
+		if slices.Contains(theirs, ourVer) {
+			return ourVer, true
 		}
 	}
 	return 0, false