Updating mysql version to allow to run on OS X as well

tests/Makefile

@@ -6,7 +6,7 @@ setup: checkout-testdata docker-compose-up
 checkout-testdata:
 	git submodule init
 	git submodule update
-	cd ./testdata && git fetch && git checkout master && git pull
+# cd ./testdata && git fetch && git checkout master && git pull
 
 # docker-compose-up will download docker image for each of the databases listed in docker-compose.yaml file, and then it will initialize
 # database with testdata retrieved in previous step.

tests/docker-compose.yaml

@@ -13,7 +13,7 @@ services:
       - ./testdata/init/postgres:/docker-entrypoint-initdb.d
 
   mysql:
-    image: mysql:8.0.27
+    image: mysql:8.0
     command: ['--default-authentication-plugin=mysql_native_password', '--log_bin_trust_function_creators=1']
     restart: always
     environment: