fix: Incorrect conversion between integer types

[ckadner]

Address code scanning alerts 1, 2, 3:

• https://github.com/kserve/modelmesh-serving/security/code-scanning/1
• https://github.com/kserve/modelmesh-serving/security/code-scanning/2
• https://github.com/kserve/modelmesh-serving/security/code-scanning/3

[kserve-oss-bot]

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This pull-request has been approved by: ckadner, rafvasq

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