Fix code scanning alert - Comparison of narrow type with wide type in loop condition

[jordanpadams]

Tracking issue for:

• https://github.com/NASA-PDS/pds4-jparser/security/code-scanning/190
• https://github.com/NASA-PDS/pds4-jparser/security/code-scanning/191
• https://github.com/NASA-PDS/pds4-jparser/security/code-scanning/192
• https://github.com/NASA-PDS/pds4-jparser/security/code-scanning/193
• https://github.com/NASA-PDS/pds4-jparser/security/code-scanning/194
• https://github.com/NASA-PDS/pds4-jparser/security/code-scanning/195
• https://github.com/NASA-PDS/pds4-jparser/security/code-scanning/196
• https://github.com/NASA-PDS/pds4-jparser/security/code-scanning/197
• https://github.com/NASA-PDS/pds4-jparser/security/code-scanning/198
• https://github.com/NASA-PDS/pds4-jparser/security/code-scanning/199