Update @iobroker/json-config requirement from ^7.1.0 to ^7.1.5 in /src-admin

[dependabot[bot]]

Updates the requirements on @iobroker/json-config to permit the latest version.

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Dependabot will merge this PR once CI passes on it, as requested by @GermanBluefox.

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[abchatra]

@pelikhan ?

[abchatra]

Lets cleanup as part of this release.

[abchatra]

@thomasjball ok to remove this extension?

[thomasjball]

@abchatra - remove it from where? the listed repos in targetconfig.json? Sure.

[thomasjball]

https://github.com/microsoft/pxt-microbit/pull/6322

[abchatra]

Fixed