CoTS support

What's Changed

• Concise Trust Anchor Stores (CoTS) support by carl-wallace
• Further CoTS test coverage by SabreenKaur

Dependabot fixes

• Bump golang.org/x/sys from 0.0.0-20211019181941-9d821ace8654 to 0.1.0 by @dependabot in #79
• Bump golang.org/x/text from 0.3.7 to 0.3.8 by @dependabot in #78

Full Changelog: v1.0.0...v1.1.0