deps: Update dependency asyncpg to v0.28.0 (#785)

Author: renovate-bot

requirements-test.txt

@@ -15,6 +15,6 @@ types-mock==5.0.0.7
 twine==4.0.2
 PyMySQL==1.1.0
 pg8000==1.29.8
-asyncpg==0.27.0
+asyncpg==0.28.0
 python-tds==1.12.0
 aioresponses==0.7.4

setup.py

@@ -77,7 +77,7 @@
         "pymysql": ["PyMySQL==1.1.0"],
         "pg8000": ["pg8000==1.29.8"],
         "pytds": ["python-tds==1.12.0"],
-        "asyncpg": ["asyncpg==0.27.0"]
+        "asyncpg": ["asyncpg==0.28.0"]
     },
     python_requires=">=3.8",
     include_package_data=True,