Drop dataclasses package from constraints file

It is part of the stdlib in all supported Python versions, so it is no
more an external dependency.

diff --git a/tests/constraints.txt b/tests/constraints.txt
index 35e5c7a98b1f9b45c1122980878bb821f9360f2c..2afc920433a1579fbcf1cad324fcd4ad72cbada7 100644 (file)
--- a/tests/constraints.txt
+++ b/tests/constraints.txt
@@ -5,7 +5,6 @@
 
 # From install_requires
 backports.zoneinfo == 0.2.0
-dataclasses == 0.8
 typing_extensions == 3.10.0.0
 
 # From the 'test' extra