separate java update as graal is not working (#1811)

Signed-off-by: Gregor Zeitlinger <gregor.zeitlinger@grafana.com>

Author: zeitlinger

.github/renovate.json5

@@ -16,6 +16,18 @@
       groupName: "mise",
       schedule: ["before 4am on monday"],
     },
+    {
+      matchFileNames: ["mise.toml"],
+      matchDepNames: ["java"],
+      groupName: "java temurin",
+      additionalBranchPrefix: "temurin-",
+    },
+    {
+      matchFileNames: [".mise/envs/native/mise.toml"],
+      matchDepNames: ["java"],
+      groupName: "java graalvm",
+      additionalBranchPrefix: "graalvm-",
+    },
   ],
   customManagers: [
     {