Bump: external snapshot CRD v0.15.0

[tico88612]

What type of PR is this?

/kind feature

What this PR does / why we need it:

Our CSI CRD version is outdated. We can upgrade to the latest version.

Which issue(s) this PR fixes:

Fixes #12131

Special notes for your reviewer:

Currently, there is no reliable way to obtain individual CRD files, so the only solution is to update first.

Does this PR introduce a user-facing change?:

Upgrade external snapshot CRD to v0.15.0

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[VannTen]

Currently, there is no reliable way to obtain individual CRD files, so the only solution is to update first.

What do you mean , they are not released on their own ?

It's not worse that what we have so let's upgrade.
/lgtm

[tico88612]

Currently, there is no reliable way to obtain individual CRD files, so the only solution is to update first.

What do you mean , they are not released on their own ?

It's not worse that what we have so let's upgrade. /lgtm

This was my original expectation, but I found that they did not have a separate CRD compression file like the Gateway API.
#12131 (comment)