fix(tests): update expected exit code for bad URL test case

Author: Locietta

tests/lib.rs

@@ -319,7 +319,7 @@ fn lock_and_source_github_tag() -> io::Result<()> {
 fn lock_and_source_github_bad_url() -> io::Result<()> {
     let case = TestCase::load("github_bad_url")?;
     case.write_config_file("plugins.toml")?;
-    case.command("lock").expect_exit_code(2).run()?;
+    case.command("lock").expect_exit_code(12).run()?;
     assert!(!case.dirs.data.join("plugins.lock").exists());
     case.command("source").run()?;
     assert!(!case.dirs.data.join("plugins.lock").exists());