consolidate hash algos used

[sjohansson]

consolidate on a modern hash algorithm, such as the one used in the code tracking, sha2_256. There are both md5 and sha1 in the code. While they are working and doing the job as expected, they also spawn warnings for completely different reasons than the current usage.

• Consolidating on a single expression makes the code cleaner
• Modernising the algorithm removes noise

Tracking issue for:

• https://github.com/data-solution-automation-engine/DIRECT/security/code-scanning/24
• https://github.com/data-solution-automation-engine/DIRECT/security/code-scanning/23
• https://github.com/data-solution-automation-engine/DIRECT/security/code-scanning/17
• https://github.com/data-solution-automation-engine/DIRECT/security/code-scanning/16
• https://github.com/data-solution-automation-engine/DIRECT/security/code-scanning/3