update go to 1.21

[hwdef]

[hwdef]

/assign @lowang-bh @Monokaix

[lowang-bh]

/lgtm

[Monokaix]

We'd better add some info like volcano has adapted k8s 1.29 and k8s has used go 1.21 and so we should keep consistent it. Also please update docker build base image to 1.21.

[hwdef]

We'd better add some info like volcano has adapted k8s 1.29 and k8s has used go 1.21 and so we should keep consistent it. Also please update docker build base image to 1.21.

Thanks for your suggestions. I fixed this

[lowang-bh]

/lgtm

[Monokaix]

/lgtm

[volcano-sh-bot]

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