chore: update dependency immutable to ^5.1.6

[seqeralabs-renovate]

This PR contains the following updates:

Package	Type	Update	Change
immutable (source)	overrides	patch	^5.1.5 → ^5.1.6

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Release Notes

immutable-js/immutable-js (immutable)

v5.1.9

Compare Source

• fix(List): a List grown past 32 elements while all its values are undefined no longer reads those values back as null (affected get, iteration, toArray, equals and hashCode)

v5.1.8

Compare Source

• fix(List): guard oversized bounds in setListBounds. Fixes CVE GHSA-v56q-mh7h-f735
• perf(Map): index large hash-collision buckets for faster lookups. Fixes CVE GHSA-xvcm-6775-5m9r

v5.1.7

Compare Source

• fix(Repeat): lastIndexOf returned size instead of size - 1 by @​chatman-media in #​2227. Fixes CVE CVE-2026-29063
• fix(IndexedCollection): has(index) on a lazy Seq of unknown size now checks index existence instead of searching for a value equal to the index #​2203
• [TypeScript]: reduce/reduceRight without an initial value now infer the result type from the collection's values when the reducer returns a value (e.g. list.reduce((a, b) => a + b) infers number), matching Array#reduce. Previously an explicit type argument was required. #​2205

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