v15.0.6

Catalyst v15.0.6

Diff since v15.0.5

Merged pull requests:

• Add example of how to compute nullclines using bifurcation kit (#1194) (@TorkelE)
• Update documenter version (#1265) (@TorkelE)
• bump deps for 15.0.6 (#1268) (@isaacsas)

Closed issues:

• Enable interpolation of functional variable (but not its argument). (#1208)
• ContinuousCallback not handled correctly (#1262)