Revert 355: restore minimal JSON Feed minimal version (#362)

Reverting #355

Thanks @lukasschwab for reactivity and clean upstream fix.

Author: Guts

requirements/testing.txt

@@ -4,7 +4,7 @@
 # -------
 
 feedparser>=6.0.11,<6.1
-jsonfeed-util>=1.1.2,<1.2.1
+jsonfeed-util>=1.2,<2
 mkdocs-material[imaging]>=9.5.47
 pytest-cov>=6,<7
 validator-collection>=1.5,<1.6