v0.19.0

Semantic Conventions

• Render notes on metric semconv tables by @joaopgrassi in #177

Semantic Conventions Schema Tool

• No changes

Protobuf

• No changes

Other

• Bump alpine from 3.17 to 3.18 in /schemas by @dependabot in #173
• Bump alpine from 3.14 to 3.18 in /protobuf by @dependabot in #174
• Bump github.com/Masterminds/semver/v3 from 3.2.0 to 3.2.1 in /schemas by @dependabot in #166
• Bump go.opentelemetry.io/otel/schema from 0.0.4-0.20230227163841-071d31739445 to 0.0.4 in /schemas by @dependabot in #140
• Bump github.com/stretchr/testify from 1.8.2 to 1.8.3 in /schemas by @dependabot in #176
• Prepare 0.19.0 release by @arminru in #178

Full Changelog: v0.18.0...v0.19.0