fix: add pytest and pytest-cov to dev dependencies

[LanusseMorais]

Summary

• Root cause: pytest was never declared as a dependency in pyproject.toml — only [tool.pytest.ini_options] config existed
• Tests passed before because a stale .venv cache happened to contain pytest from a previous manual install
• Added pytest >= 8.0.0 and pytest-cov >= 5.0.0 to [tool.poetry.group.dev.dependencies]
• This should unblock integration tests on PR chore: 🐝 Update SDK - Generate 3.0.1 #26

Context

PR #27 removed the conditional if: cache-hit != 'true' on poetry install, but that alone didn't fix the issue because poetry install correctly reports "No dependencies to install" when pytest isn't in the lock file.

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Note

Low Risk
Low risk: changes are limited to development/testing dependencies and poetry.lock regeneration, with no runtime code or production dependency changes.

Overview
Ensures the test runner is installed consistently by adding pytest and pytest-cov to [tool.poetry.group.dev.dependencies].

Regenerates poetry.lock to include pytest, pytest-cov, and their transitive dev-only dependencies (e.g., coverage, pluggy, iniconfig, packaging, pygments), and updates lock metadata (including the Poetry generator/version header).

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Unbounded version constraints resolved to unexpected major versions

Low Severity

The pytest and pytest-cov constraints use >= (unbounded) while all other dev dependencies (mypy, pylint, pyright) use exact == pins. This inconsistency already caused the lock file to resolve pytest to 9.0.2 (a whole major version beyond the >= 8.0.0 floor) and pytest-cov to 7.1.0 (two major versions beyond >= 5.0.0). Using ^ or tighter bounds would prevent unintended major-version jumps on future lock regeneration and match the pinning strategy of the other dev dependencies.