Bump version to 1.11.0+dev #12277

Job	Run time
Test mypyc suite with 32-bit Python	8m 6s
Test suite with py38-ubuntu, mypyc-compiled	20m 31s
Test suite with py38-windows-64	27m 26s
Test suite with py39-ubuntu	19m 2s
Test suite with py310-ubuntu	19m 58s
Test suite with py311-ubuntu, mypyc-compiled	18m 9s
Test suite with py312-ubuntu, mypyc-compiled	19m 54s
mypyc runtime tests with py39-macos	9m 39s
mypyc runtime tests with py38-debug-build-ubuntu	5m 16s
Type check our own code (py38-ubuntu)	1m 52s
Type check our own code (py38-windows-64)	2m 21s
Formatting and code style with Black + ruff	36s
	2h 32m 50s

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