Add pyupgrade

[spoorcc]

Description by Korbit AI

What change is being made?

Add and enforce pyupgrade across the codebase by introducing a new pre-commit hook, updating CI to run pyupgrade, and modernizing type hints and minor syntax to align with Python 3.9+ standards.

Why are these changes being made?

To automatically modernize Python syntax and typings, keep the codebase aligned with current language features, and ensure code quality via CI and pre-commit checks. If applicable, this also reduces manual churn by applying consistent, up-to-date conventions.

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[korbit-ai]

Review by Korbit AI

Korbit automatically attempts to detect when you fix issues in new commits.

Category	Issue	Status
	Reporter registration violates Open-Closed Principle ▹ view

Files scanned

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File Path	Reviewed
dfetch/reporting/init.py	✅
dfetch/resources/init.py	✅
dfetch/reporting/reporter.py	✅
dfetch/reporting/stdout_reporter.py	✅
dfetch/main.py	✅
dfetch/commands/common.py	✅
dfetch/manifest/remote.py	✅
dfetch/commands/command.py	✅
dfetch/util/cmdline.py	✅
dfetch/commands/freeze.py	✅
dfetch/reporting/check/jenkins_reporter.py	✅
dfetch/util/purl.py	✅
dfetch/commands/report.py	✅
dfetch/util/versions.py	✅
dfetch/util/util.py	✅
dfetch/project/git.py	✅
dfetch/reporting/check/code_climate_reporter.py	✅
dfetch/project/metadata.py	✅
dfetch/commands/check.py	✅
dfetch/commands/diff.py	✅
dfetch/commands/update.py	✅
dfetch/reporting/check/sarif_reporter.py	✅
dfetch/reporting/check/reporter.py	✅
dfetch/reporting/sbom_reporter.py	✅
dfetch/commands/import_.py	✅
dfetch/project/vcs.py	✅
dfetch/manifest/project.py	✅
dfetch/project/svn.py	✅
dfetch/manifest/manifest.py	✅
dfetch/vcs/git.py	✅

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