Fix: create table default cast returns unparsable section

[NelsonTorres]

fixes #4141

When creating a new table and casting the default value with "::" no longer returns unparseable section

Are there any other side effects of this change that we should be aware of?

No

Pull Request checklist

• [X ] Please confirm you have completed any of the necessary steps below.

• Included test cases to demonstrate any code changes, which may be one or more of the following:

  • .yml rule test cases in test/fixtures/rules/std_rule_cases.
  • .sql/.yml parser test cases in test/fixtures/dialects (note YML files can be auto generated with tox -e generate-fixture-yml).
  • Full autofix test cases in test/fixtures/linter/autofix.
  • Other.

• Added appropriate documentation for the change.

• Created GitHub issues for any relevant followup/future enhancements if appropriate.

[codecov]

Codecov Report

Base: 100.00% // Head: 100.00% // No change to project coverage 👍

Coverage data is based on head (25141f8) compared to base (1b0dc82).
Patch has no changes to coverable lines.

Additional details and impacted files

@@            Coverage Diff            @@
##              main     #4192   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files          197       197           
  Lines        14932     14932           
=========================================
  Hits         14932     14932           

Impacted Files	Coverage Δ
src/sqlfluff/dialects/dialect_ansi.py	100.00% <ø> (ø)

Help us with your feedback. Take ten seconds to tell us how you rate us. Have a feature suggestion? Share it here.

☔ View full report at Codecov.
📢 Do you have feedback about the report comment? Let us know in this issue.