Update dependency io.swagger.parser.v3:swagger-parser to v2.1.20

Author: renovate[bot]

kotest-extensions-ktor-openapi-plugin/build.gradle.kts

@@ -21,7 +21,7 @@ dependencies {
    api(projects.kotestExtensionsKtorOpenapiModel)
    implementation("io.ktor:ktor-server-core:2.2.4")
    implementation("io.ktor:ktor-server-auth:2.2.4")
-   implementation("io.swagger.parser.v3:swagger-parser:2.1.19")
+   implementation("io.swagger.parser.v3:swagger-parser:2.1.20")
    implementation("io.kotest:kotest-framework-api:5.5.5")
    implementation("io.kotest:kotest-framework-engine:5.5.5")
    testImplementation("io.ktor:ktor-client-apache:2.2.4")