ci: bump to go 1.23 (#453)

Upgrade to Go 1.23.

Upgrade also requires bumping `golangci-lint` to v1.62.2, and upgrading
third-party test versions for some failing cases.

pass/alloc_test.go

@@ -78,7 +78,7 @@ func TestAllocatorPriority(t *testing.T) {
 		a.Add(x[i].ID())
 	}
 
-	for i := 0; i < n; i++ {
+	for i := range n {
 		for j := i + 1; j < n; j++ {
 			a.AddInterference(x[i].ID(), x[j].ID())
 		}

pass/cfg.go

@@ -39,7 +39,7 @@ func CFG(fn *ir.Function) error {
 	n := len(is)
 
 	// Populate successors.
-	for i := 0; i < n; i++ {
+	for i := range n {
 		cur := is[i]
 		var nxt *ir.Instruction
 		if i+1 < n {

pass/reg_test.go

@@ -120,7 +120,7 @@ func TestAllocateRegistersBasePointerDeprioritized(t *testing.T) {
 	ctx.SignatureExpr("func() uint64")
 
 	x := make([]reg.GPVirtual, n)
-	for i := 0; i < n; i++ {
+	for i := range n {
 		x[i] = ctx.GP64()
 		ctx.MOVQ(operand.U64(i), x[i])
 	}