all: add Go 1.24 support

src/runtime/synctest.go

@@ -0,0 +1,15 @@
+package runtime
+
+// Dummy implementation of synctest functions (we don't support synctest at the
+// moment).
+
+//go:linkname synctest_acquire internal/synctest.acquire
+func synctest_acquire() any {
+	// Dummy: we don't support synctest.
+	return nil
+}
+
+//go:linkname synctest_release internal/synctest.release
+func synctest_release(sg any) {
+	// Dummy: we don't support synctest.
+}