chore: update to go 1.21.0 #408

Job	Run time
Build snapshot artifacts	1m 17s
Discover supported schema versions	6s
Unit tests (Go)	1m 17s
Static analysis	3m 56s
Unit tests (Python)	1m 32s
CLI tests (Python)	1m 42s
Acceptance tests (1)	11m 21s
Acceptance tests (2)	11m 24s
Acceptance tests (3)	11m 34s
Acceptance tests (4)	11m 15s
Acceptance tests (5)	10m 39s
CLI tests (Go-Linux)	1m 7s
	1h 7m 10s

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