Fix JWT signing issue

[marktx1980]

Made adjustment to JWTSigner to make it public for a call in iOS app...un-callable previously due to private restrictions...at least that is what I remember it was.

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[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

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