chore(deps-dev): Update pyupgrade requirement from 3.20.0 to 3.21.0 #2120

Job	Run time
Linting & Coding Standards	36s
test dependencies	50s
find Upgradable CodingFeatures	44s
StaticCodingAnalysis (py3.13 -current)	47s
StaticCodingAnalysis (py3.9 -lowest)	50s
find Security Issues	42s
install & run "cyclonedx-py --help" (macos-latest)	11s
install & run "cyclonedx-py --help" (ubuntu-latest)	14s
install & run "cyclonedx-py --help" (windows-latest)	57s
Test (ubuntu-latest py3.12)	2m 45s
Test (ubuntu-latest py3.11)	2m 30s
Test (macos-latest py3.12)	3m 11s
install & run "python -m cyclonedx_py --help" (ubuntu-latest)	24s
Test (windows-latest py3.13)	6m 4s
Test (windows-latest py3.12)	5m 6s
install & run "python -m cyclonedx_py --help" (macos-latest)	19s
Test (macos-latest py3.11)	3m 24s
Test (ubuntu-latest py3.9)	3m 9s
Test (macos-13 py3.10)	4m 58s
install & run "python -m cyclonedx_py --help" (windows-latest)	33s
Test (ubuntu-latest py3.13)	2m 50s
Test (ubuntu-latest py3.10)	2m 44s
Test (windows-latest py3.10)	4m 16s
Test (windows-latest py3.9)	5m 39s
Test (windows-latest py3.11)	5m 35s
Test (macos-13 py3.9)	5m 45s
Test (macos-latest py3.13)	3m 23s
Publish test coverage	5s
	1h 8m 31s

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