Update dependency ring:ring-core to v1.15.4

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
ring:ring-core	managed-dependencies	minor	1.14.2 → 1.15.4

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Release Notes

ring-clojure/ring (ring:ring-core)

v1.15.4

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• Updated Apache Commons FileUpload to 2.0.0-M5 (#​551)
• Updated Jetty to 12.1.8 (#​552)
• Updated Apache Commons IO to 2.21.0

v1.15.3

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• Fixed reflection warnings in ring.adapter.jetty

v1.15.2

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• Fixed reflection warnings in ring.core.protocols
• Fixed reflection warnings in ring.middleware.content-length

v1.15.1

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• Fixed bug with wrap-content-length and nil responses

v1.15.0

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• Functionally the same as 1.15.0-RC1

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