v0.6.6

See migration guide

• [bb layer] Upgrade Babashka to v0.7.4
• [holy-lambda] Simplify default & async retrievers
• [bb tasks] Fix tasks hl:doctor command
• [holy-lambda] Add images of GraalVM 22.2.0
• [docs] Update docs
• [babashka] Fix typo in babashka tutorial
• [holy-lambda] Fix 1 arity of #'hr/status