Rewrite plugin, use filenames in lockfile

fixtures/projects/s3/maven/kotlin/build.gradle.kts

@@ -0,0 +1,17 @@
+plugins {
+    java
+}
+
+repositories {
+    maven {
+        url = uri("s3://repositories/m2")
+        credentials(AwsCredentials::class) {
+            accessKey = "foo"
+            secretKey = "bar"
+        }
+    }
+}
+
+dependencies {
+    implementation("org.apache:test:1.0.0")
+}