Upgrade to pymssql 2.1.5 for Py 3.8 support (#11523)

setup.py

@@ -39,7 +39,6 @@
 version = mod.version  # type: ignore
 
 PY3 = sys.version_info[0] == 3
-PY38 = PY3 and sys.version_info[1] >= 8
 
 my_dir = dirname(__file__)
 
@@ -328,7 +327,7 @@ def write_version(filename: str = os.path.join(*[my_dir, "airflow", "git_version
     'pymongo>=3.6.0',
 ]
 mssql = [
-    'pymssql~=2.1.1',
+    'pymssql~=2.1,>=2.1.5',
 ]
 mysql = [
     'mysql-connector-python>=8.0.11, <=8.0.18',
@@ -649,11 +648,6 @@ def write_version(filename: str = os.path.join(*[my_dir, "airflow", "git_version
         'snakebite',
     ])
 
-if PY38:
-    PACKAGES_EXCLUDED_FOR_ALL.extend([
-        'pymssql',
-    ])
-
 # Those packages are excluded because they break tests (downgrading mock) and they are
 # not needed to run our test suite.
 PACKAGES_EXCLUDED_FOR_CI = [