[SDK-2988] Fix psalm test warnings around specificity of integer types and positive values

[evansims]

Changes

This PR addresses some new test warnings introduced by upgraded Psalm test suite rules.

References

• Addresses an upstream change introduced in Psalm with PR 6861, cut later with a minor release, that is causing our test suite to fail. PR requires positive integers for sleep methods.
• Addresses an upstream changed introduced in Psalm with PR 6824, cut later in a minor release, that is causing our test suite to fail. PR requires $_SESSION superglobal be checked for it's state.

Testing

Run standard tests using composer run tests or more specifically composer run tests:psalm before this PR patch and after to see the Psalm warnings resolved. Tests continue to otherwise pass at 100% coverage.

Contributor Checklist

• I have read the Auth0 general contribution guidelines
• I have read the Auth0 Code of Conduct

[github-actions]

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