fix tests and remove tarfile tar.Reader as sink

Author: am0o0

go/ql/src/experimental/frameworks/DecompressionBombs.qll

@@ -645,19 +645,6 @@ module DecompressionBombs {
     }
   }
 
-  /**
-   * Provides Decompression Sinks for `"archive/tar` package
-   */
-  module ArchiveTar {
-    class TheSink extends Sink {
-      TheSink() {
-        exists(Method f | f.hasQualifiedName("archive/tar", "Reader", "Read") |
-          this = f.getACall().getReceiver()
-        )
-      }
-    }
-  }
-
   /**
    * Provides Decompression Sinks for packages that use some standard IO interfaces/methods for reading decompressed data
    */