Clean up workaround for Gradle 6 in Configurations.kt

[tadjan]

Since the minimal supported Gradle version is now 7.4, the workaround for Gradle 6 in plugin/src/main/kotlin/org/jlleitschuh/gradle/ktlint/Configurations.kt can now be removed.

        // Workaround for gradle 6 https://github.com/gradle/gradle/issues/13255
        val oldProp = target.objects.listProperty(Dependency::class.java)
        dependencies.addAllLater(
            oldProp.value(
                extension.version.map {
                    if (SemVer.parse(it) < SemVer(1, 0, 0)) {
                        target.logger.info("Add dependency: ktlint version $it")
                        listOf(target.dependencies.create("com.pinterest:ktlint:$it"))
                    } else {
                        target.logger.info("Add dependencies: ktlint version $it")
                        listOf(
                            target.dependencies.create("com.pinterest.ktlint:ktlint-cli:$it"),
                            // these transitive deps were introduced in ktlint 1.0, but for some reason not picked up automatically
                            target.dependencies.create("io.github.oshai:kotlin-logging:5.1.0"),
                            target.dependencies.create("io.github.detekt.sarif4k:sarif4k:0.5.0")
                        )
                    }
                }
            )
        )

It's not only obsolete code at this point, but also hardcodes dependencies on old versions of kotlin-logging and sarif4k libraries.