[infra] Update cmake docker image to be Debian 10

Bug: skia:12256
Change-Id: Ic5cad6d6e5e7155f0adc26fca9f1172f33ce3b3a
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/431260
Reviewed-by: Ben Wagner <bungeman@google.com>
Commit-Queue: Ben Wagner <bungeman@google.com>
4 files changed