Update config.toml (#24621)

Author: steveny91

.ddev/config.toml

@@ -216,6 +216,7 @@ exclude = [
     'psutil',
     'pyvmomi',      # 9+ has breaking changes
     'pymongo',      # Upgrade from 4.8.0 to 4.10.1 causes "AttributeError: module 'pymongo' has no attribute 'mongo_client'"
+    'pymysql',      # Pinned to below 1.2.0 as requested by DBM while they work on supporting 1.2+
     'foundationdb', # 7+ has a breaking changes
     'ddtrace', # 4.5.1 does not support MacOS 11, which is used by the Agent