Tests

Bump alpine from 3.20.3 to 3.21.0 #425

Job	Run time
build-and-test	2m 14s
versions	1s
lint	1m 47s
copyright / validate	4s
go-checks / Check that code matches gofumpt	18s
go-checks / Check that go.mod and go.sum are tidy	16s
vault:1.17.6 kind:1.31.2	5m 50s
vault:1.18.1 kind:1.31.2	5m 51s
vault:1.16.3 kind:1.31.2	6m 26s
vault:1.18.1 kind:1.30.6	5m 56s
vault:1.18.1 kind:1.29.10	5m 55s
vault:1.18.1 kind:1.28.15	5m 49s
vault:1.18.1 kind:1.27.16	5m 2s
	45m 29s

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