Bump golang to 1.18.9

ashmckenzie · ashmckenzie · commit 97988f8876b5 · 2023-02-01T01:05:45.000Z
diff --git a/.tool-versions b/.tool-versions
@@ -1,2 +1,2 @@
 ruby 3.0.5
-golang 1.18.7
+golang 1.18.9
