Bump immutabledict from 4.1.0 to 4.2.0 #1179

Job	Run time
changes	2s
check-lockfile	8s
lint-crlf	4s
lint-newsfile	0s
check-schema-delta	39s
check-sampleconfig	2m 22s
lint	1m 31s
Typechecking	3m 13s
lint-pydantic	2m 27s
lint-clippy	0s
lint-clippy-nightly	0s
lint-rustfmt	0s
linting-done	4s
calculate-test-jobs	5s
portdb (3.8, 11)	3m 33s
trial-olddeps	7m 20s
portdb (3.11, 15)	3m 28s
cargo-test	0s
complement (monolith, SQLite)	12m 49s
complement (monolith, Postgres)	13m 26s
trial-pypy	0s
cargo-bench	0s
complement (workers, Postgres)	20m 39s
trial (3.8, sqlite, all)	5m 38s
sytest (focal)	7m 49s
trial (3.8, postgres, 11, all)	11m 43s
sytest (focal, postgres)	10m 17s
trial (3.8, sqlite)	4m 25s
sytest (focal, multi-postgres, workers)	14m 29s
sytest (focal, multi-postgres, workers, asyncio)	19m 23s
export-data	3m 17s
tests-done	2s
	2h 28m 53s

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