Upgrade rubyzip to v2 and align Zip::File create API usage

[Copilot]

This updates the project from rubyzip v1 to v2 and removes v1-era Zip::File create semantics so zip creation remains compatible with the current API surface.

• Dependency version bump

  • Updated gemspec runtime dependency from rubyzip ~> 1.3 to rubyzip ~> 2.0.
  • Updated lockfile resolution to the rubyzip v2 line.

• Runtime API compatibility

  • Replaced deprecated Zip::File::CREATE mode usage with keyword-based creation in zip write paths.
  • Touched both model upload packaging and process deployment packaging codepaths.

# before
Zip::File.open(path, Zip::File::CREATE) { |zip| ... }

# after
Zip::File.open(path, create: true) { |zip| ... }