bug#60856: 29.0.60; C-M-f in python-ts-mode does not work properly with docstrings

[Apostolis Bessas]

In python-ts-mode executing C-M-f (forward-sexp) when at the beginning
of a docstring does not go to the end of the docstring (as happens in
python-mode), but at the end of the file.

However, if I switch to python-mode and then back to python-ts-mode,
C-M-f works correctly. See the following example:

- Start emacs -Q
- Execute:

(add-to-list 'auto-mode-alist '("\\.py\\'" . python-ts-mode))

- Create the file test.py with the contents:

"""Some docstring.

The docstring has multiple lines.
"""

x = 1

- Go to the first character in the file (beginning of docstring) and
  press C-M-f. The point is moved to the end of the file (after the line
  `x = 1`). Instead, the point should have been moved to the end of the
  docstring (line 4, last '"' character).

- Switch to python-mode and then back to python-ts-mode and repeat the
  above step. The point is moved to the end of the docstring.

In GNU Emacs 29.0.60 (build 1, x86_64-pc-linux-gnu, GTK+ Version
 3.24.36, cairo version 1.17.6) of 2023-01-16 built on galileo
Repository revision: 352e41016bcaab8566347091b6b61908a9b57b57
Repository branch: emacs-29
System Description: Arch Linux

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