chore: wrapped appsettings object with secure() decorator

[juliamuiruri4]

Added the @secure() decorator for appsettings parameter to allow users to securely set values for appsettings, and that they are handled securely without being exposed in deployment logs.

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[juliamuiruri4]

Issue: #460

[manekinekko]

Thanks @juliamuiruri4 for working on this issue. The author of the issue #460 also mentionned that this project is using older versions of the bicep modules and recommended an upgrade. Would you like to add those as well?

[juliamuiruri4]

Thanks @juliamuiruri4 for working on this issue. The author of the issue #460 also mentionned that this project is using older versions of the bicep modules and recommended an upgrade. Would you like to add those as well?

Sure