Update circleci xcode version (#9405)

Summary:
xcode 11.3.1 is deprecated https://circleci.com/docs/2.0/testing-ios/ , jobs are failing:
```
failed to create host: Image xcode:11.3.0 is not supported
```

Pull Request resolved: https://github.com/facebook/rocksdb/pull/9405

Test Plan: CI

Reviewed By: ajkr, hx235

Differential Revision: D33674462

Pulled By: jay-zhuang

fbshipit-source-id: 85dd27aad84d26eaaa5c5375015344182b2c50b9

.circleci/config.yml

@@ -162,8 +162,10 @@ executors:
 jobs:
   build-macos:
     macos:
-      xcode: 11.3.0
+      xcode: 12.5.1
     resource_class: large
+    environment:
+      DISABLE_JEMALLOC: 1 # jemalloc cause env_test hang, disable it for now
     steps:
       - increase-max-open-files-on-macos
       - install-pyenv-on-macos
@@ -174,7 +176,7 @@ jobs:
 
   build-macos-cmake:
     macos:
-      xcode: 11.3.0
+      xcode: 12.5.1
     resource_class: large
     steps:
       - increase-max-open-files-on-macos
@@ -550,14 +552,16 @@ jobs:
 
   build-macos-java:
     macos:
-      xcode: 11.3.0
+      xcode: 12.5.1
     resource_class: medium
     environment:
       JAVA_HOME: /Library/Java/JavaVirtualMachines/adoptopenjdk-8.jdk/Contents/Home
+      DISABLE_JEMALLOC: 1 # jemalloc causes java 8 crash, maybe a known issue
     steps:
       - increase-max-open-files-on-macos
       - install-pyenv-on-macos
       - install-gflags-on-macos
+      - install-jdk8-on-macos
       - pre-steps-macos
       - run:
           name: "Set Java Environment"