remove commons-codec usage from core

[mawinter69]

Since Java 17 we have HexFormat so use it instead of an own implementation
Remove usage of commons-codec and use already existing methods from Util

Testing done

relying on the integrated tests

Proposed changelog entries

• human-readable text

Proposed upgrade guidelines

N/A

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[A1exKH]

@mawinter69 LGTM.

[krisstern]

/label ready-for-merge

This PR is now ready for merge, after ~24 hours, we will merge it if there's no negative feedback.