Release 0.28.0 #3136

Job	Run time
test_min_deps (ubuntu-latest)	43s
test_min_deps (windows-latest)	1m 21s
test_min_deps (macos-latest)	47s
Integration Tests (pdm.minimal.lock)	23s
Integration Tests (pdm.lock)	28s
test (3.10, windows-latest)	1m 40s
test (3.11, ubuntu-latest)	1m 7s
test (3.10, ubuntu-latest)	1m 10s
test (3.12, windows-latest)	1m 41s
test (3.12, macos-latest)	1m 4s
test (3.10, macos-latest)	1m 4s
test (3.11, macos-latest)	54s
test (3.13, windows-latest)	1m 44s
test (3.13, ubuntu-latest)	1m 15s
test (3.13, macos-latest)	1m 17s
test (3.11, windows-latest)	3m 5s
test (3.14, windows-latest)	1m 50s
test (3.14, ubuntu-latest)	1m 7s
test (3.14, macos-latest)	46s
test (3.12, ubuntu-latest)	1m 2s
Combine & check coverage	16s
	24m 44s

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