Add Politeknik Negeri balikpapan

[m2azura125]

This PR adds poltekba.ac.id for Politeknik Negeri Balikpapan, an official higher education institution in Indonesia.

Official website:

• https://poltekba.ac.id/

Evidence that this is an official educational institution:

• https://poltekba.ac.id/
• https://poltekba.ac.id/tentang-poltekba/
• https://poltekba.ac.id/program-studi/

Evidence of long-term academic programs, including technology-related programs:

• https://poltekba.ac.id/program-studi/
• https://daftar.poltekba.ac.id/program-studi

Evidence that the domain is officially used by the institution:

• https://daftar.poltekba.ac.id/
• https://pmb.poltekba.ac.id/kontak/

Evidence of student email usage:

• Active students use email addresses under the @poltekba.ac.id domain.
• Student email pattern in use: [email protected]
• Additional proof can be provided if maintainers request it.

[m2azura125]