all "is" replaced with "=="

[Kalyani-Puranik]

Describe your change:

• Add an algorithm?
• Fix a bug or typo in an existing algorithm?
• Add or change doctests? -- Note: Please avoid changing both code and tests in a single pull request.
• Documentation change?

Checklist:

• I have read CONTRIBUTING.md.
• This pull request is all my own work -- I have not plagiarized.
• I know that pull requests will not be merged if they fail the automated tests.
• This PR only changes one algorithm file. To ease review, please open separate PRs for separate algorithms.
• All new Python files are placed inside an existing directory.
• All filenames are in all lowercase characters with no spaces or dashes.
• All functions and variable names follow Python naming conventions.
• All function parameters and return values are annotated with Python type hints.
• All functions have doctests that pass the automated testing.
• All new algorithms include at least one URL that points to Wikipedia or another similar explanation.
• If this pull request resolves one or more open issues then the description above includes the issue number(s) with a closing keyword: "Fixes #ISSUE-NUMBER".

[Copilot]

Pull request overview

This PR improves code quality by replacing identity checks (is) with equality checks (==) when comparing boolean values in the palindrome.py file. While is technically works for boolean singletons in Python, == is the semantically correct operator for value comparison and aligns with Python best practices.

Changes:

• Replaced is with == in assertions and doctests that compare boolean function results with boolean values
• Updated benchmark function string formatting to use == instead of is

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