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/server/petstore/php-symfony/SymfonyBundle-php/Resources/docs/Api/PetApiInterface.md

@@ -31,6 +31,8 @@ services:
 
 Add a new pet to the store
 
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 ### Example Implementation
 ```php
 <?php
@@ -91,6 +93,8 @@ Name | Type | Description  | Notes
 
 Deletes a pet
 
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 ### Example Implementation
 ```php
 <?php
@@ -338,6 +342,8 @@ Name | Type | Description  | Notes
 
 Update an existing pet
 
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 ### Example Implementation
 ```php
 <?php
@@ -398,6 +404,8 @@ Name | Type | Description  | Notes
 
 Updates a pet in the store with form data
 
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 ### Example Implementation
 ```php
 <?php
@@ -460,6 +468,8 @@ void (empty response body)
 
 uploads an image
 
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 ### Example Implementation
 ```php
 <?php

samples/server/petstore/php-symfony/SymfonyBundle-php/Resources/docs/Api/StoreApiInterface.md

@@ -194,6 +194,8 @@ No authorization required
 
 Place an order for a pet
 
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 ### Example Implementation
 ```php
 <?php

samples/server/petstore/php-symfony/SymfonyBundle-php/Resources/docs/Api/UserApiInterface.md

@@ -93,6 +93,8 @@ void (empty response body)
 
 Creates list of users with given input array
 
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 ### Example Implementation
 ```php
 <?php
@@ -153,6 +155,8 @@ void (empty response body)
 
 Creates list of users with given input array
 
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 ### Example Implementation
 ```php
 <?php
@@ -275,6 +279,8 @@ void (empty response body)
 
 Get user by user name
 
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 ### Example Implementation
 ```php
 <?php
@@ -327,6 +333,8 @@ No authorization required
 
 Logs user into the system
 
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 ### Example Implementation
 ```php
 <?php
@@ -380,6 +388,8 @@ No authorization required
 
 Logs out current logged in user session
 
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 ### Example Implementation
 ```php
 <?php