[bionic] linux-gke-4.15 4.15.0-1045.48 uploaded (ABI bump)

[brad.figg at canonical.com]

A new bionic kernel has been uploaded into proposed. Note the ABI bump. 
The full changelog about all bug fixes contained in this upload can be found at:

https://launchpad.net/ubuntu/bionic/+source/linux-gke-4.15/4.15.0-1045.48

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