Prepare for 0.0.5

[RobertoPrevato]

• Add the --checkout option to the create command to support using specific
  branches and tags. Example:
  blacksheep create my-proj2 --template mvc --checkout v1.0.2.
• Add support for int and float question types (to enable budget
  validation).
• Add missing __init__.py files.
• Update dependencies, apply latest formatting from black.
• Workflow maintenance.
• Remove Python 3.8 from the build matrix, add Python 3.12 and 3.13.