Update parser to 2.0.29 (#11388)

* update parser to 2.0.29

* better handling of null in dereferencing

* update parser to 2.0.30

* update core to newer version

* add new files

* rollback to previous stable version

* remove files

* Fixes for python-experimental NullableShape component

Co-authored-by: Justin Black <justin.a.black@gmail.com>

samples/openapi3/client/petstore/python/docs/UserApi.md

@@ -98,6 +98,8 @@ No authorization required
 
 Creates list of users with given input array
 
+
+
 ### Example
 
 
@@ -177,6 +179,8 @@ No authorization required
 
 Creates list of users with given input array
 
+
+
 ### Example
 
 
@@ -322,6 +326,8 @@ No authorization required
 
 Get user by user name
 
+
+
 ### Example
 
 
@@ -389,6 +395,8 @@ No authorization required
 
 Logs user into the system
 
+
+
 ### Example
 
 
@@ -456,6 +464,8 @@ No authorization required
 
 Logs out current logged in user session
 
+
+
 ### Example