maint: test: bump clojure 12

Author: lread

deps.edn

@@ -17,7 +17,7 @@
            :1.9 {:override-deps {org.clojure/clojure {:mvn/version "1.9.0"}}}
            :1.10 {:override-deps {org.clojure/clojure {:mvn/version "1.10.3"}}}
            :1.11 {:override-deps {org.clojure/clojure {:mvn/version "1.11.4"}}}
-           :1.12 {:override-deps {org.clojure/clojure {:mvn/version "1.12.2"}}}
+           :1.12 {:override-deps {org.clojure/clojure {:mvn/version "1.12.3"}}}
 
            ;;
            ;; ClojureScript version we test with (and support)