chore(deps): update otel/opentelemetry-collector-contrib docker tag to v0.121.0

This MR contains the following updates:

Package	Update	Change
otel/opentelemetry-collector-contrib	minor	0.120.0 -> 0.121.0

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Release Notes

open-telemetry/opentelemetry-collector-releases (otel/opentelemetry-collector-contrib)

v0.121.0

Compare Source

🚀 New components 🚀

• aesprovider: Add the AES provider to the contrib distribution (#​843)
• envoyalsreceiver: Add the Envoy ALS receiver to the contrib distribution (#​842)
• netflowreceiver: Add the NetFlow receiver to the contrib distribution (#​847)
• s3provider: Add the s3 provider to the contrib distribution (#​546)
• secretsmanagerprovider: Add the Secrets Manager provider to the contrib distribution (#​844)

💡 Enhancements 💡

• images: set USER_GID alongside USER_UID (#​662)

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