Use the correct form of sha256.Sum256.

[mcsaucy]

sha256.New().Sum(foo) appends the SHA-256 hash for nil to foo. See https://go.dev/play/p/vSW0U3Hq4qk

What type of PR is this?

/kind bug

What this PR does / why we need it:

Honestly, you probably don't need it but the current behavior of defining a cache filename as $URL + SHA256("") is silly. This would be an actual bug if y'all weren't using MkdirAll to build out the path, but you are.

Which issue(s) this PR fixes:

None

Special notes for your reviewer:

That's a good shirt.

Does this PR introduce a user-facing change?

Cache filenames generated by the license downloader will now be derived from a SHA256 digest of the URL, rather than the URL itself + SHA256("")

[linux-foundation-easycla]

• ✅login: mcsaucy / (7dd788e)

The committers listed above are authorized under a signed CLA.

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[puerco]

/ok-to-test

[puerco]

you probably don't need it

Quite the opposite, thank you for fixing this @mcsaucy !

/lgtm
/approve

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: mcsaucy, puerco

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