update deprecated delegates

Author: hauner

buildSrc/src/main/kotlin/openapiparser.test.gradle.kts

@@ -15,7 +15,7 @@ val libs = the<LibrariesForLibs>()
 
 testing {
     suites {
-        val test by getting(JvmTestSuite::class) {
+        getByName<JvmTestSuite>("test") {
             useJUnitJupiter()
         }
     }

json-schema-validator/build.gradle.kts

@@ -20,7 +20,8 @@ dependencies {
     testImplementation(libs.logback)
 }
 
-val generateTestManifest by tasks.registering(GenerateManifestTask::class) {
+val generateTestManifest = tasks.register<GenerateManifestTask>("generateTestManifest") {
+    description = "Generates the test manifest for the JSON Schema Test Suite"
     val resourcesPath = "src/test/resources"
     val testsPath = "$resourcesPath/suites/JSON-Schema-Test-Suite/tests"