Fix reflection warnings (#16005)

log4j includes different class files for different jvm versions. This
means our uberjar includes these versions so we are a multi-release
jar. Need to set this in our manifest.

Fixes the reflection warning seen on startup on jdk 11's

~/p/w/metabase ❯❯❯ java -jar target/uberjar/metabase.jar
WARNING: sun.reflect.Reflection.getCallerClass is not supported. This will impact performance.

project.clj

@@ -170,9 +170,11 @@
 
   :main ^:skip-aot metabase.core
 
-  ;; Liquibase uses this manifest parameter to dynamically find extensions at startup (via classpath scanning, etc)
   :manifest
-  {"Liquibase-Package"
+  {;; log4j is multi-release and lein uberjar doesn't set this correctly in the manifest
+   "Multi-Release" true
+   ;; Liquibase uses this manifest parameter to dynamically find extensions at startup (via classpath scanning, etc)
+   "Liquibase-Package"
    #= (eval
        (str "liquibase.change,liquibase.changelog,liquibase.database,liquibase.parser,liquibase.precondition,"
             "liquibase.datatype,liquibase.serializer,liquibase.sqlgenerator,liquibase.executor,"