fix(release): add typing-extensions as dependency (#12648)
diff --git a/setup.py b/setup.py
index 998360b..867df032 100644
--- a/setup.py
+++ b/setup.py
@@ -105,6 +105,7 @@
"sqlalchemy>=1.3.16, <2.0, !=1.3.21",
"sqlalchemy-utils>=0.36.6,<0.37",
"sqlparse==0.3.0", # PINNED! see https://github.com/andialbrecht/sqlparse/issues/562
+ "typing-extensions>=3.7.4.3,<4", # needed to support typing.Literal on py37
"wtforms-json",
"pyparsing>=2.4.7, <3.0.0",
"holidays==0.10.3", # PINNED! https://github.com/dr-prodigy/python-holidays/issues/406