chore(deps): update module go.opentelemetry.io/build-tools to v0.21.0

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This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
go.opentelemetry.io/build-tools	v0.20.0 -> v0.21.0

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Release Notes

open-telemetry/opentelemetry-go-build-tools (go.opentelemetry.io/build-tools)

v0.21.0

Compare Source

💡 Enhancements 💡

• chloggen: Add a --component, -c flag to chloggen update to specify a filter of which component to add to the changelog. (#​725)
• githubgen: Add support for chloggen components list generation (#​717)

🧰 Bug fixes 🧰

• issuegenerator: Fix duplicated owner when calling GitHub APIs. (#​720)

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