bug: alias syntax definition in except_clause and except_group_clause is redundant

[digitcrusher]

Did you check existing issues?

• [ ] I have read all the tree-sitter docs if it relates to using the parser
• [x] I have searched the existing issues of tree-sitter-python

Tree-Sitter CLI Version, if relevant (output of tree-sitter --version)

tree-sitter 0.25.8 (f2f197b6b27ce75c280c20f131d4f71e906b86f7)

Describe the bug

The alias syntax in except clauses is already handled by except_clause → value field → expression → as_pattern, thus what follows after the value field in except_clause is redundant.

Steps To Reproduce/Bad Parse Tree

(module [0, 0] - [9, 0]
  (try_statement [0, 0] - [3, 6]
    body: (block [1, 2] - [1, 6]
      (pass_statement [1, 2] - [1, 6]))
    (except_clause [2, 0] - [3, 6]
      value: (as_pattern [2, 7] - [2, 21]
        (identifier [2, 7] - [2, 16])
        alias: (as_pattern_target [2, 20] - [2, 21]
          (identifier [2, 20] - [2, 21])))
      (block [3, 2] - [3, 6]
        (pass_statement [3, 2] - [3, 6]))))
  (try_statement [5, 0] - [8, 6]
    body: (block [6, 2] - [6, 6]
      (pass_statement [6, 2] - [6, 6]))
    (except_group_clause [7, 0] - [8, 6]
      (as_pattern [7, 8] - [7, 22]
        (identifier [7, 8] - [7, 17])
        alias: (as_pattern_target [7, 21] - [7, 22]
          (identifier [7, 21] - [7, 22])))
      (block [8, 2] - [8, 6]
        (pass_statement [8, 2] - [8, 6])))))

Expected Behavior/Parse Tree

The redundant as syntax definition should either be removed or made to actually work.

Repro

try:
  pass
except Exception as e:
  pass

try:
  pass
except* TypeError as e:
  pass