Downgrade async gem to 1.30.1 until 2.0+ is more stable (getting: Errno::EPERM: Operation not permitted - IO_Event_Selector_EPoll_io_wait:epoll_ctl, when trying to cache a file)

Gemfile

@@ -6,7 +6,7 @@ gem "i18n"
 gem "rexml"
 gem "digest-crc"
 gem "ffi"
-gem "async"
+gem "async", "~>1.30.1"
 gem "async-http"
 gem "async-websocket"
 gem "thread-local"

Gemfile.lock

@@ -65,7 +65,7 @@ PLATFORMS
   x86_64-linux
 
 DEPENDENCIES
-  async
+  async (~> 1.30.1)
   async-http
   async-websocket
   cyberarm_engine
@@ -77,4 +77,4 @@ DEPENDENCIES
   thread-local
 
 BUNDLED WITH
-   2.2.28
+   2.3.3