0.21.0

This release contains security fixes that have been discovered using Fable 5.

What's Changed

• fix(security): reject unsafe entries during archive extraction by @albertodebortoli in #91
• fix(security): warn when installing a tool without checksum verification by @albertodebortoli in #92
• fix(security): warn when verifying with a broken hash algorithm by @albertodebortoli in #93
• fix(security): pass pipeline parameters via environment, not shell text by @albertodebortoli in #94
• fix(security): contain skill file writes within the skill directory by @albertodebortoli in #95
• fix(security): reject symlinks when fetching skills from a git repo by @albertodebortoli in #96

Full Changelog: 0.20.0...0.21.0