Bump immutabledict from 4.0.0 to 4.1.0 #196

Job	Run time
check-lockfile	7s
changes	2s
lint-crlf	3s
lint-newsfile	0s
check-schema-delta	39s
Typechecking	2m 43s
check-sampleconfig	2m 30s
lint	1m 35s
lint-clippy-nightly	0s
lint-clippy	0s
lint-pydantic	2m 19s
lint-rustfmt	0s
linting-done	3s
calculate-test-jobs	8s
trial-olddeps	6m 42s
portdb (3.8, 11)	3m 20s
complement (monolith, SQLite)	12m 3s
portdb (3.11, 15)	3m 18s
cargo-bench	0s
complement (monolith, Postgres)	13m 12s
cargo-test	0s
complement (workers, Postgres)	19m 16s
trial-pypy	0s
sytest (focal)	8m 17s
sytest (focal, postgres)	9m 50s
trial (3.8, sqlite, all)	5m 51s
sytest (focal, multi-postgres, workers)	14m 14s
trial (3.8, postgres, 11, all)	11m 15s
sytest (focal, multi-postgres, workers, asyncio)	19m 12s
trial (3.8, sqlite)	5m 19s
export-data	2m 48s
tests-done	2s
	2h 24m 48s

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