fix(flet-cli): correct dependency parsing (#6332)

[td3447]

Fix #6332

Summary

Commit message

Closes issue: #6332

• Adds a space (' ') in front of dependencies in pyproject.toml that have version constraints starting with < or <=.
• Fixes the issue where flet build would give a The system cannot find the file specified. error.

Additional Details

• This prevents users from having to manually edit the pyproject.toml after adding dependencies with uv add. uv does have a leading space before the < but with flet build a lack of leading space raises an error.
• The function looks for a <= or < and bypasses all others, if it has one from the list then it appends a space and adds that to the set.

Test Code

• Builds tested on the following.

flet build windows | linux | apk

Type of change

• Bug fix (non-breaking change which fixes an issue)

Summary by Sourcery

Bug Fixes:

• Ensure dependencies with < or <= version constraints are formatted with a leading space to avoid build failures when parsing pyproject.toml dependencies.

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[FeodorFitsner]

Thank you for your PR!

This only fixes project.dependencies. flet build / flet publish prefer tool.poetry.dependencies first, and get_poetry_dependencies() can still emit pkg<ver without normalization, so Poetry users may still hit the same issue. Can you fix that too please?

[td3447]

Updates

• Added compatibility with poetry
• Edited format_dependency_version() to include checks for < or <= and include a leading space.

Test Code

• Builds tested on the following.

poetry run flet build windows | apk

Tests

[tool.poetry.dependencies]
 ✅ chardet = "<=6"
 ✅ chardet = "<6"
 ✅ chardet = "   <     6  "