treewide: update sqlc

Change-Id: I72b0f33989bb0032d5a42bc888cdfac666db2a54
Reviewed-on: https://review.monogon.dev/c/monogon/+/2309
Reviewed-by: Serge Bazanski <serge@monogon.tech>
Tested-by: Jenkins CI
diff --git a/WORKSPACE b/WORKSPACE
index 2bd11f5..96372c6 100644
--- a/WORKSPACE
+++ b/WORKSPACE
@@ -312,7 +312,7 @@
 
 libpg_query_external(
     name = "libpg_query",
-    version = "13-2.2.0",
+    version = "15-4.2.3",
 )
 
 register_toolchains("//:host_python")