chore: update dependency qs to ^6.15.3

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
qs	^6.15.2 → ^6.15.3

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Release Notes

ljharb/qs (qs)

v6.15.3

Compare Source

• [Fix] parse: enforce throwOnLimitExceeded for cumulative array growth via combine/merge
• [Fix] utils: respect encoding of surrogate pairs across chunks (#​559)
• [Robustness] parse: throw the arrayLimit error before splitting oversized comma values
• [Robustness] utils.merge / utils.assign: avoid invoking __proto__ setter when copying own properties
• [Robustness] utils: enforce arrayLimit consistently across merge's array paths
• [Perf] utils: make compact O(n) via a side-channel visited-set instead of Array.indexOf
• [Deps] update side-channel
• [Dev Deps] update eslint, mock-property, tape
• [Tests] parse: characterize current lenient handling of unbalanced bracket keys (#​558)

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