Fix snapshot cleanup

Changelog for 0.18.7:

• PR #358 Fix snapshot key error by @shivabohemian
• PR #356 Bump google.golang.org/protobuf from 1.31.0 to 1.33.0 by @dependabot[bot]

Commits
ffac406 Updates for go.mod by @alexellis
dd31784 Fix snapshot key error by wangqiang
70b0929 Bump google.golang.org/protobuf from 1.31.0 to 1.33.0 by @dependabot[bot]

Changes: 0.18.6...0.18.7

Generated by Derek