chore: Use Kotest's withEnvironment again

This was re-introduced in Kotest 6.0.3.

Signed-off-by: Sebastian Schuberth <sebastian@doubleopen.org>

Author: sschuberth

model/src/test/kotlin/config/OrtConfigurationTest.kt

@@ -25,6 +25,7 @@ import io.kotest.assertions.throwables.shouldThrow
 import io.kotest.core.TestConfiguration
 import io.kotest.core.spec.style.WordSpec
 import io.kotest.engine.spec.tempfile
+import io.kotest.extensions.system.withEnvironment
 import io.kotest.matchers.collections.containExactly
 import io.kotest.matchers.collections.containExactlyInAnyOrder
 import io.kotest.matchers.maps.beEmpty
@@ -42,7 +43,6 @@ import org.ossreviewtoolkit.model.SourceCodeOrigin
 import org.ossreviewtoolkit.plugins.api.PluginConfig
 import org.ossreviewtoolkit.utils.common.EnvironmentVariableFilter
 import org.ossreviewtoolkit.utils.ort.ORT_REFERENCE_CONFIG_FILENAME
-import org.ossreviewtoolkit.utils.test.withEnvironment
 
 class OrtConfigurationTest : WordSpec({
     "OrtConfiguration" should {

utils/common/src/funTest/kotlin/ProcessCaptureFunTest.kt

@@ -20,11 +20,10 @@
 package org.ossreviewtoolkit.utils.common
 
 import io.kotest.core.spec.style.StringSpec
+import io.kotest.extensions.system.withEnvironment
 import io.kotest.matchers.shouldBe
 import io.kotest.matchers.string.shouldContain
 
-import org.ossreviewtoolkit.utils.test.withEnvironment
-
 class ProcessCaptureFunTest : StringSpec({
     "Environment variables should be passed correctly" {
         val env = mapOf("PREFIX" to "This is some path: ", "SOME_PATH" to "/foo/bar")