Bump nextmv version to v0.16.0-dev.0 #490

Job	Run time
python-test (3.9, ubuntu-latest, nextmv)	56s
python-test (3.9, windows-latest, nextmv)	1m 57s
python-test (3.9, macos-latest, nextmv)	1m 13s
python-test (3.9, macos-13, nextmv)	1m 15s
python-test (3.10, ubuntu-latest, nextmv)	56s
python-test (3.10, windows-latest, nextmv)	2m 41s
python-test (3.10, macos-latest, nextmv)	1m 0s
python-test (3.10, macos-13, nextmv)	1m 18s
python-test (3.11, ubuntu-latest, nextmv)	55s
python-test (3.11, windows-latest, nextmv)	3m 9s
python-test (3.11, macos-latest, nextmv)	42s
python-test (3.11, macos-13, nextmv)	1m 31s
python-test (3.12, ubuntu-latest, nextmv)	1m 1s
python-test (3.12, windows-latest, nextmv)	2m 57s
python-test (3.12, macos-latest, nextmv)	42s
python-test (3.12, macos-13, nextmv)	1m 24s
python-test (3.13, ubuntu-latest, nextmv)	58s
python-test (3.13, windows-latest, nextmv)	3m 39s
python-test (3.13, macos-latest, nextmv)	1m 19s
python-test (3.13, macos-13, nextmv)	1m 34s
	31m 7s

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