[MAINT] Bump version to 2.7.0dev3 #60

Job	Run time
build_windows (3.10)	6m 17s
build_windows (3.14)	8m 20s
build_windows (3.11)	7m 5s
build_windows (3.13)	6m 15s
build_linux (3.10)	3m 38s
build_windows (3.12)	6m 25s
build_linux (3.14)	3m 16s
build_linux (3.12)	3m 29s
build_linux (3.13)	3m 25s
build_linux (3.11)	3m 5s
test_linux (3.12, false, ubuntu-latest)	1m 36s
test_linux (3.11, false, ubuntu-latest)	1m 27s
test_linux (3.14, false, ubuntu-latest)	1m 32s
test_linux (3.10, false, ubuntu-latest)	1m 32s
test_linux (3.13, false, ubuntu-latest)	1m 22s
test_windows (3.11, false, windows-latest)	3m 19s
test_windows (3.10, false, windows-latest)	3m 43s
test_windows (3.12, false, windows-latest)	3m 21s
test_windows (3.14, false, windows-latest)	4m 23s
test_windows (3.13, false, windows-latest)	4m 6s
	1h 17m 36s

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