fix(deps): update ktor.client.core to v2.3.9

[renovate[bot]]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
io.ktor:ktor-client-mock	2.3.8 -> 2.3.9
io.ktor:ktor-client-cio	2.3.8 -> 2.3.9
io.ktor:ktor-client-logging	2.3.8 -> 2.3.9
io.ktor:ktor-client-core	2.3.8 -> 2.3.9

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Release Notes

ktorio/ktor (io.ktor:ktor-client-mock)

### [`v2.3.9`](https://togithub.com/ktorio/ktor/releases/tag/2.3.9) [Compare Source](https://togithub.com/ktorio/ktor/compare/2.3.8...2.3.9) > Published 4 March 2024 ##### Improvements - Allow to set secure cookie even with http scheme ([KTOR-3159](https://youtrack.jetbrains.com/issue/KTOR-3159)) ##### Bugfixes - ContentNegotiation: the plugin appends duplicated MIME type to Accept header ([KTOR-6684](https://youtrack.jetbrains.com/issue/KTOR-6684))

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