Bump pipdeptree from 2.13.1 to 2.21.0 in /src/requirements

[dependabot[bot]]

Bumps pipdeptree from 2.13.1 to 2.21.0.

Release notes

Sourced from pipdeptree's releases.

2.21.0

What's Changed

• Implement --python auto for virtual environment detection by @​kemzeb in tox-dev/pipdeptree#366

Full Changelog: https://github.com/tox-dev/pipdeptree/compare/2.20.0...2.21.0

2.20.0

What's Changed

• Remove publish job from the check workflow by @​kemzeb in tox-dev/pipdeptree#361
• Mimic pip when handling --user-only in a virtual environment by @​kemzeb in tox-dev/pipdeptree#364

Full Changelog: https://github.com/tox-dev/pipdeptree/compare/2.19.1...2.20.0

2.19.1

What's Changed

• Point "Changelog" project URL at Releases page by @​jwodder in tox-dev/pipdeptree#359

New Contributors

• @​jwodder made their first contribution in tox-dev/pipdeptree#359

Full Changelog: https://github.com/tox-dev/pipdeptree/compare/2.19.0...2.19.1

2.19.0

What's Changed

• Use dropdown instead of checkbox in bug report template by @​kemzeb in tox-dev/pipdeptree#356
• Have duplicate metadata and invalid req strings honor --warn option by @​kemzeb in tox-dev/pipdeptree#357

Full Changelog: https://github.com/tox-dev/pipdeptree/compare/2.18.1...2.19.0

2.18.1

What's Changed

• Modify tests to ensure $PYTHONPATH is given to the custom interpreter by @​kemzeb in tox-dev/pipdeptree#353
• Fix test_console failure finding pipdeptree in other environments by @​xiacunshun in tox-dev/pipdeptree#351

Full Changelog: https://github.com/tox-dev/pipdeptree/compare/2.18.0...2.18.1

... (truncated)

Commits

• 3c41d39 [pre-commit.ci] pre-commit autoupdate (#367)
• 0f558b3 Implement --python auto for environment detection (#366)
• 5cc7ba2 [pre-commit.ci] pre-commit autoupdate (#365)
• e88356f Mimic pip when handling --user-only in a virtual environment (#364)
• 1476bf7 [pre-commit.ci] pre-commit autoupdate (#363)
• 4c832b5 Remove publish job from the check workflow (#361)
• a1bf845 [pre-commit.ci] pre-commit autoupdate (#360)
• ff3e3e0 Point "Changelog" project URL at Releases page (#359)
• 4a5f90a Have duplicate metadata and invalid reqs warnings honor --warn (#357)
• c325803 [pre-commit.ci] pre-commit autoupdate (#358)
• Additional commits viewable in compare view

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