v1.25.1

Changelog

0a8243d Add CRC32 and MD5 hashes for preseeded files (#504)
2a2f94f Move checksum functions to internal package
fa7b38f build(deps): bump actions/cache from 2.1.5 to 2.1.6 (#505)
7973188 build(deps): bump github.com/google/go-cmp from 0.5.5 to 0.5.6 (#502)
6477e20 build(deps): bump google.golang.org/api from 0.46.0 to 0.47.0 (#499)
369a31e build(deps): bump google.golang.org/api in /examples/go (#500)
1e5462f build(deps): bump urllib3 from 1.26.4 to 1.26.5 in /examples/python (#503)
2ebdc3f internal/checksum: add some tests