Update layers/meta-balena digest to e7a8680

[balena-renovate[bot]]

This PR contains the following updates:

Package	Update	Change
layers/meta-balena	digest	0fed99e -> e7a8680

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This PR has been generated by Renovate Bot.

[floion]

@resin-jenkins test this please

[floion]

@resin-jenkins test this please