Update plugin jreleaser to v1.21.0

Author: renovate[bot]

gradle/libs.versions.toml

@@ -105,7 +105,7 @@ foojayResolver = { id = "org.gradle.toolchains.foojay-resolver", version = "1.0.
 gitPublish = { id = "org.ajoberstar.git-publish", version = "5.1.3" }
 japicmp = { id = "me.champeau.gradle.japicmp", version = "0.4.6" }
 jmh = { id = "me.champeau.jmh", version = "0.7.3" }
-jreleaser = { id = "org.jreleaser", version = "1.20.0" }
+jreleaser = { id = "org.jreleaser", version = "1.21.0" }
 # check if workaround in gradle.properties can be removed when updating
 kotlin = { id = "org.jetbrains.kotlin.jvm", version = "2.2.21" }
 nullaway = { id = "net.ltgt.nullaway", version = "2.3.0" }