Update python/ql/lib/semmle/python/security/dataflow/TarSlipCustomizations.qll

Co-authored-by: Rasmus Wriedt Larsen <rasmuswriedtlarsen@gmail.com>

python/ql/lib/semmle/python/security/dataflow/TarSlipCustomizations.qll

@@ -31,13 +31,6 @@ module TarSlip {
    */
   abstract class Sanitizer extends DataFlow::Node { }
 
-  /**
-   * DEPRECATED: Use `Sanitizer` instead.
-   *
-   * A sanitizer guard for "tar slip" vulnerabilities.
-   */
-  abstract deprecated class SanitizerGuard extends DataFlow::BarrierGuard { }
-
   /**
    * A call to `tarfile.open`, considered as a flow source.
    */