Update yarn version

hachi8833 · hachi8833 · commit f3d861c202d8 · 2020-08-14T13:14:29.000+09:00
diff --git a/docker-compose.yml b/docker-compose.yml
@@ -11,7 +11,7 @@ x-var: &POSTGRES
 x-var: &NODE_MAJOR
   12
 x-var: &YARN_VERSION
-  1.21.1
+  1.22.4
 
 x-app: &app
   build:
