Update dependency org.jetbrains.kotlinx:atomicfu to v0.26.0 (#4418)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Author: renovate[bot]

gradle/libs.versions.toml

@@ -4,7 +4,7 @@ kotlinx-html = "0.11.0"
 kotlinx-datetime = "0.6.1"
 kotlinx-io = "0.5.4"
 coroutines = "1.9.0"
-atomicfu = "0.25.0"
+atomicfu = "0.26.0"
 serialization = "1.7.3"
 ktlint = "3.15.0"
 kotlinx-browser = "0.2"