Update dependency apn to v1.7.8

This MR contains the following updates:

Package	Type	Update	Change	References
apn	dependencies	patch	1.7.5 -> 1.7.8	source

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Release Notes

node-apn/node-apn

v1.7.8

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Features

• Add support for Mutable Content (#​413)

v1.7.7

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v1.7.6

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Fixes

• Emit an error when retry limit is exceeded (#​333)
• Documentation fixes (#​229, #​343, #​379)
• Reinstate broken aps behaviour (#​377)

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