Fix compatibility with Python < 3.10

Dataclass kw_only argument was added only in Python 3.10 but EL9 image
has only 3.9.21.

diff --git a/bin/tests/system/nsec3-answer/tests_nsec3.py b/bin/tests/system/nsec3-answer/tests_nsec3.py
index 8396e9bb5eea0276952764691c2c80174b57fc20..33d16aca7f0d013b2de49085f0992621a1f731b5 100755 (executable)
--- a/bin/tests/system/nsec3-answer/tests_nsec3.py
+++ b/bin/tests/system/nsec3-answer/tests_nsec3.py
@@ -268,7 +268,7 @@ def check_wildcard_synthesis(qname: dns.name.Name, nsec3check: "NSEC3Checker") -
     nsec3check.check_extraneous_rrs()
 
 
-@dataclass(kw_only=True, frozen=True)
+@dataclass(frozen=True)
 class NSEC3Params:
     """Common values from a single DNS response"""