Backport of upgrade vault-plugin-auth-kubernetes into release/1.9.x

[hc-github-team-secure-vault-core]

Backport

This PR is auto-generated from #14144 to be assessed for backporting due to the inclusion of the label backport/1.9.x.

WARNING automatic cherry-pick of commits failed. Commits will require human attention.

The below text is copied from the body of the original PR.

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Include hashicorp/vault-plugin-auth-kubernetes#137

• ensure valid entity alias names created for projected volume tokens.

go get github.com/hashicorp/vault-plugin-auth-kubernetes@a0cae6852325e5163027805dc2193523d07ff786

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