all: set Go language version to Go 1.23

Go 1.25 was released recently.

Change-Id: I5e2c9ad87bc0067dac912d6f80c793e06e87e63b
Reviewed-on: https://go-review.googlesource.com/c/protobuf/+/696316
Reviewed-by: Lasse Folger <lassefolger@google.com>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>

Author: stapelberg

encoding/protowire/wire_test.go

@@ -9,6 +9,7 @@ import (
 	"encoding/hex"
 	"io"
 	"math"
+	"slices"
 	"strings"
 	"testing"
 )
@@ -679,22 +680,13 @@ func TestZigZag(t *testing.T) {
 	}
 }
 
-// TODO(go1.23): use slices.Repeat
-var testvals = func() []uint64 {
-	// These values are representative for the values that we observe when
-	// running benchmarks extracted from Google production workloads.
-	vals := []uint64{
-		1, 2, 3, 4, 5, 6, 7, 8, 9, 10,
-		55, 66, 77, 88, 99, 100,
-		123456789, 98765432,
-	}
-	newslice := make([]uint64, 100*len(vals))
-	n := copy(newslice, vals)
-	for n < len(newslice) {
-		n += copy(newslice[n:], newslice[:n])
-	}
-	return newslice
-}()
+// These values are representative for the values that we observe when
+// running benchmarks extracted from Google production workloads.
+var testvals = slices.Repeat([]uint64{
+	1, 2, 3, 4, 5, 6, 7, 8, 9, 10,
+	55, 66, 77, 88, 99, 100,
+	123456789, 98765432,
+}, 100)
 
 func BenchmarkSizeVarint(b *testing.B) {
 	var total int

go.mod

@@ -1,6 +1,6 @@
 module google.golang.org/protobuf
 
-go 1.22
+go 1.23
 
 require (
 	github.com/golang/protobuf v1.5.0

integration_test.go

@@ -40,9 +40,9 @@ var (
 		// This matches the version policy of the Google Cloud Client Libraries:
 		// https://cloud.google.com/go/getting-started/supported-go-versions
 		return []string{
-			"1.22.12",
-			"1.23.9",
-			"1.24.2",
+			"1.23.12",
+			"1.24.6",
+			"1.25.0",
 		}
 	}()
 	golangLatest = golangVersions[len(golangVersions)-1]