Bump github.com/golang/glog from 1.1.2 to 1.2.1

[dependabot[bot]]

Bumps github.com/golang/glog from 1.1.2 to 1.2.1.

Release notes

Sourced from github.com/golang/glog's releases.

v1.2.1

What's Changed

• glog: don't hold mutex when sync'ing by @​chressie in golang/glog#68

Full Changelog: https://github.com/golang/glog/compare/v1.2.0...v1.2.1

v1.2.0

What's Changed

• glog: add context variants and logsink tests by @​chressie in golang/glog#66

Full Changelog: https://github.com/golang/glog/compare/v1.1.2...v1.2.0

Commits

• 861d094 glog: don't hold mutex when sync'ing (#68)
• b256bbe glog: add context variants to most log functions
• bcf3184 glog/internal/logsink: add logsink tests
• See full diff in compare view

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