proxmox-apt: update tests to expect bookworm

Signed-off-by: Wolfgang Bumiller <w.bumiller@proxmox.com>

proxmox-apt/tests/repositories.rs

@@ -416,7 +416,7 @@ fn test_standard_repositories() -> Result<(), Error> {
 fn test_get_current_release_codename() -> Result<(), Error> {
     let codename = get_current_release_codename()?;
 
-    assert!(codename == DebianCodename::Bullseye);
+    assert!(codename == DebianCodename::Bookworm);
 
     Ok(())
 }