fix: use correct Uri syntax

src/lib.rs

@@ -184,7 +184,7 @@ impl Client {
 
     fn get_cache_entry(&self, key: &CacheKey) -> Result<Option<String>> {
         let uri = format!(
-            "{}_apis/artifactcache/cache/keys={}&version=0",
+            "{}_apis/artifactcache/cache?keys={}&version=0",
             self.base_url, key.0
         );
         println!("cache entry uri: {uri}");