Replace Twisted with an empty bz2 package (#3258)

## Summary

This is just an empty package taken from packse, rezipped with `tar -cjf
bz2-1.0.0.tar.bz2 bz2-1.0.0`.

crates/uv/tests/pip_sync.rs

@@ -671,15 +671,16 @@ fn install_sdist_url() -> Result<()> {
 fn install_sdist_archive_type_bz2() -> Result<()> {
     let context = TestContext::new("3.8");
 
-    // Install a version of Twisted that uses `.tar.bz2`.
     let requirements_txt = context.temp_dir.child("requirements.txt");
-    requirements_txt.write_str("Twisted==20.3.0")?;
+    requirements_txt.write_str("bz2==1.0.0")?;
 
     uv_snapshot!(command(&context)
         .arg("requirements.txt")
         .arg("--no-binary")
         .arg(":all:")
-        .arg("--strict"), @r###"
+        .arg("--strict")
+        .arg("--find-links")
+        .arg(context.workspace_root.join("scripts/links/")), @r###"
     success: true
     exit_code: 0
     ----- stdout -----
@@ -688,14 +689,7 @@ fn install_sdist_archive_type_bz2() -> Result<()> {
     Resolved 1 package in [TIME]
     Downloaded 1 package in [TIME]
     Installed 1 package in [TIME]
-     + twisted==20.3.0
-    warning: The package `twisted` requires `zope-interface>=4.4.2`, but it's not installed.
-    warning: The package `twisted` requires `constantly>=15.1`, but it's not installed.
-    warning: The package `twisted` requires `incremental>=16.10.1`, but it's not installed.
-    warning: The package `twisted` requires `automat>=0.3.0`, but it's not installed.
-    warning: The package `twisted` requires `hyperlink>=17.1.1`, but it's not installed.
-    warning: The package `twisted` requires `pyhamcrest!=1.10.0,>=1.9.0`, but it's not installed.
-    warning: The package `twisted` requires `attrs>=19.2.0`, but it's not installed.
+     + bz2==1.0.0
     "###
     );