Backport the change where we stop patching charms on Juju versions >= 3.6.9

[simskij]

This goes for all charms currently in the 1/ track.

• github.com/canonical/mimir-coordinator-k8s-operator
• github.com/canonical/loki-coordinator-k8s-operator
• github.com/canonical/tempo-operators

See canonical/tempo-operators#161 for reference.

Reassign the issue to the people who will do the fixes.

[Abuelodelanada]

@simskij track/1 is out of support and track/2 is not affected any more after #161