Rewrite plugin, use filenames in lockfile

fixtures/projects/dependency/snapshot/groovy/build.gradle

@@ -0,0 +1,14 @@
+plugins {
+    id "java"
+}
+
+repositories {
+    maven {
+        url = uri(System.getProperty("org.nixos.gradle2nix.m2"))
+        allowInsecureProtocol = true
+    }
+}
+
+dependencies {
+    implementation "org.apache:test-SNAPSHOT2:2.0.2-SNAPSHOT"
+}

fixtures/projects/dependency/snapshot/kotlin/build.gradle.kts

@@ -0,0 +1,15 @@
+
+plugins {
+    java
+}
+
+repositories {
+    maven {
+        url = uri(System.getProperty("org.nixos.gradle2nix.m2"))
+        isAllowInsecureProtocol = true
+    }
+}
+
+dependencies {
+    "implementation"("org.apache:test-SNAPSHOT2:2.0.2-SNAPSHOT")
+}