fix: [OCI8] Bug: Argument #1 ($value) must be of type ?int, string given

[allyblaise]

Fixes #8809

cast $this->port to string on ctype_digit of OCI8 Connection

Checklist:

• [ ] Securely signed commits
• [ ] Component(s) with PHPDoc blocks, only if necessary or adds value
• [ ] Unit testing, with >80% coverage
• [ ] User guide updated
• [ ] Conforms to style guide

[kenjis]

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[paulbalandan]

I don't think this is the fix for the referenced issue. The issue is on BaseBuilder::limit() called on Model which complains of string value. Then, this fix forces a string port. So I think this is a fix to a different issue.

[kenjis]

I do not see why this PR should be merged. If you send PRs, please describe why.