correctly indicate external-provisioner go.mod version by major for proper module resolution

[jakobmoellerdev]

What happened:

I tried importing the command of external-provisioner with go get github.com/kubernetes-csi/external-provisioner@v3.6.2 but couldn't because the go.mod does not properly include the version path suffix at https://github.com/kubernetes-csi/external-provisioner/blob/master/go.mod#L1

What you expected to happen:

I expect the version suffix to follow the major version (currently /v3), just like for external-snapshotter: https://github.com/kubernetes-csi/external-snapshotter/blob/master/go.mod#L1

How to reproduce it:

Attempt to build a go module and depend on any package of external-provisioner with go get github.com/kubernetes-csi/external-provisioner@v3.6.2

Anything else we need to know?:

Even though there aren't a lot of use cases, this is common go hygiene and shouldn't be too hard to fix.

Environment:

• Driver version: 3.6.2

[wenwutang1]

hello

[msau42]

/help

[k8s-ci-robot]

@msau42:
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