fix: pass only strings to trimIndent

src/bin/tools/jar.ts

@@ -35,7 +35,7 @@ export default async function jar({ groupId, artifactId, version, rootPath, targ
     const pomProps: ZipSource = {
         path: `META-INF/maven/${groupId}/${artifactId}/pom.properties`,
         data: Buffer.from(trimIndent`# Generated by keycloakify
-            # ${new Date()}
+            # ${new Date().toString()}
             artifactId=${artifactId}
             groupId=${groupId}
             version=${version}