fix: typo in the run unit tests command (#217)

Author: bhaoz

buildspec-release.yml

@@ -19,7 +19,7 @@ phases:
       # run unit tests
       - AWS_ACCESS_KEY_ID= AWS_SECRET_ACCESS_KEY= AWS_SESSION_TOKEN=
         AWS_CONTAINER_CREDENTIALS_RELATIVE_URI= AWS_DEFAULT_REGION=
-        tox -e py38,py39,py310 all -- test/unit
+        tox -e py38,py39,py310 -- test/unit
 
       # run functional tests
       - $(aws ecr get-login --no-include-email --region us-west-2)