Update volume.py

[kvadrik]

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".

[kvadrik]

The CI errors are not related to my changes - they're
in other files (hash_table_with_linked_list.py,
linear_discriminant_analysis.py, jump_search.py).
My code runs correctly as shown when tested separately.

[mindaugl]

It is likely more efficient to replace 2**0.5 with math.sqrt(2)

[kvadrik]

It is likely more efficient to replace 2**0.5 with math.sqrt(2)

But how can I do this after I have committed my change?