Python: Remove modeling of sqlescapy PyPI package

I've never seen this being used in real code, and this library doesn't
have a lot of traction, so I would rather not commit to supporting it
(which includes verifying that it actually makes things safe).

Personally I don't think this is the right approach for avoiding SQL
injection either.

python/ql/src/experimental/semmle/python/frameworks/SqlAlchemy.qll

@@ -312,19 +312,6 @@ private module SqlAlchemy {
       )
     }
   }
-
-  /**
-   * Gets a reference to `sqlescapy.sqlescape`.
-   *
-   * See https://pypi.org/project/sqlescapy/
-   */
-  class SQLEscapySanitizerCall extends DataFlow::CallCfgNode, SQLEscape::Range {
-    SQLEscapySanitizerCall() {
-      this = API::moduleImport("sqlescapy").getMember("sqlescape").getACall()
-    }
-
-    override DataFlow::Node getAnInput() { result = this.getArg(0) }
-  }
 }
 
 private module OldModeling {