update maven resolver filter

Author: rolang

modules/sbt-plugin-1_3_11/src/main/scala/org/scalasteward/sbt/plugin/StewardPlugin_1_3_11.scala

@@ -70,11 +70,12 @@ object StewardPlugin_1_3_11 extends AutoPlugin {
           } yield Resolver.Header(headerKey, headerValue)
 
         val resolvers = fullResolvers.value.collect {
-          case repo: MavenRepository if Set("http:", "https:").exists(repo.root.startsWith) =>
-            val creds = getCredentials(new URL(repo.root), repo.name)
+          case repo: MavenRepository if !repo.root.startsWith("file:") =>
+            val creds =
+              if (Set("http:", "https:").exists(repo.root.startsWith))
+                getCredentials(new URL(repo.root), repo.name)
+              else None
             Resolver.MavenRepository(repo.name, repo.root, creds, getHeaders(repo.name))
-          case repo: MavenRepository =>
-            Resolver.MavenRepository(repo.name, repo.root, None, getHeaders(repo.name))
           case repo: URLRepository =>
             val ivyPatterns = repo.patterns.ivyPatterns.mkString
             val creds = getCredentials(new URL(ivyPatterns), repo.name)