Add changelog for release 0.75.11 #1659

Job	Run time
test (3.7, lint)	53s
deploy	55s
test (3.7, lint_docs)	2m 15s
test (3.7, mypy)	3m 43s
test (3.7, unit-quick)	16m 36s
test (3.7, unit-diagnostic-servebasic-gx-dev)	5m 50s
test (3.7, unit-nonredundant-noclientbuild-noshed-gx-2105)	30m 21s
test (3.7, unit-nonredundant-noclientbuild-noshed-gx-2109)	40m 32s
test (3.7, unit-nonredundant-noclientbuild-noshed-gx-dev)	37m 49s
test (3.7, unit-nonredundant-noclientbuild-noshed-nogx)	1h 25m 33s
test (3.7, unit-diagnostic-serveclientcmd)	16m 33s
test (3.11, lint)	43s
test (3.11, mypy)	49s
test (3.11, unit-quick)	18m 20s
	4h 20m 52s

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