Bump alpine from 3.20 to 3.21 #6781

Job	Run time
Go Integration Tests (sqlite)	1m 7s
Go Lint	2m 16s
Build (darwin/amd64)	1m 22s
Go Integration Tests (sqlcipher)	50s
Go Compatibility Tests (Mlflow 1.30.0 - postgres://postgres:postgres@postgres/postgres)	1m 40s
Build (darwin/arm64)	1m 0s
Go Integration Tests (postgres)	54s
Go Compatibility Tests (Mlflow 1.30.0 - sqlite:///db/mlflow.db)	1m 27s
Go Unit Tests	1m 5s
Build (linux/amd64)	2m 6s
Go Compatibility Tests (Mlflow 2.13.0 - postgres://postgres:postgres@postgres/postgres)	1m 40s
Build (linux/arm64)	3m 14s
Go Compatibility Tests (Mlflow 2.13.0 - sqlite:///db/mlflow.db)	1m 40s
Build (windows/amd64)	1m 51s
Python Lint	19s
Python Integration Tests (aim)	1m 31s
Python Integration Tests (mlflow)	2m 26s
Python Integration Tests (fml_client)	2m 16s
All required checks done	1s
Push to GitHub Container Registry	13s
Release	0s
	28m 58s

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