setup: require jinja<3.1 to prevent breakage

Jinja 3.1 breaks many things due to removal of obsolete features and sometimes it's pulled in by apkg during

pip install apkg

Stay on <3.1 for now until this mess is fixed across the ecosystem.

added enhancement label

assigned to @jruzicka

added 1 commit

• d120a385 - setup: require jinja<3.1 to prevent breakage

Compare with previous version

mentioned in merge request knot/knot-resolver!1248 (merged)

merged

mentioned in commit 12e885f5