chore: build with Go 1.26; use Go 1.25 features (#10570)

WaitGroup.Go and built-in gomaxprocs handling.

Signed-off-by: Jakob Borg <jakob@kastelo.net>

cmd/strelaysrv/main.go

@@ -22,7 +22,6 @@ import (
 
 	"golang.org/x/time/rate"
 
-	_ "github.com/syncthing/syncthing/lib/automaxprocs"
 	"github.com/syncthing/syncthing/lib/build"
 	"github.com/syncthing/syncthing/lib/config"
 	"github.com/syncthing/syncthing/lib/events"

cmd/strelaysrv/session.go

@@ -158,19 +158,12 @@ func (s *session) Serve() {
 			}
 
 			wg := sync.WaitGroup{}
-			wg.Add(2)
 
 			var err0 error
-			go func() {
-				err0 = s.proxy(s.conns[0], s.conns[1])
-				wg.Done()
-			}()
+			wg.Go(func() { err0 = s.proxy(s.conns[0], s.conns[1]) })
 
 			var err1 error
-			go func() {
-				err1 = s.proxy(s.conns[1], s.conns[0])
-				wg.Done()
-			}()
+			wg.Go(func() { err1 = s.proxy(s.conns[1], s.conns[0]) })
 
 			sessionMut.Lock()
 			activeSessions = append(activeSessions, s)

cmd/strelaysrv/testutil/main.go

@@ -15,7 +15,6 @@ import (
 	"path/filepath"
 	"time"
 
-	_ "github.com/syncthing/syncthing/lib/automaxprocs"
 	syncthingprotocol "github.com/syncthing/syncthing/lib/protocol"
 	"github.com/syncthing/syncthing/lib/relay/client"
 	"github.com/syncthing/syncthing/lib/relay/protocol"