Replace non-existent curl image

[mysticaltech]

The tutum/curl image no longer exists, the official curl image from https://github.com/curl/curl-docker is curlimages/curl, and it works with the demo instructions above.

What this PR does / why we need it:

It will ease the use of the demo, and allow for copy-pasting of working commands.

Types of changes

Broken container image replacement

Which issue/s this PR fixes

None that I know of.

How Has This Been Tested?

Yes tested, works with the same instructions, only the container image needs to change.

Checklist:

• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I've read the CONTRIBUTION guide
• I have added tests to cover my changes.
• All new and existing tests passed.

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[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: mysticaltech
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[tao12345666333]

I remember there was already a PR for this.

[rikatz]

#7224 <- is a dup

[tao12345666333]

#7224 <- is a dup

Thanks, I tried to find it but couldn't find it 😂

Let's close this.

@mysticaltech Thanks for your contribution！

/close

[k8s-ci-robot]

@tao12345666333: Closed this PR.

In response to this:

#7224 <- is a dup

Thanks, I tried to find it but couldn't find it 😂

Let's close this.

@mysticaltech Thanks for your contribution！

/close

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[mysticaltech]

Hey folks, pleasure, but I changed a lot fewer things than #7224, just the missing image. So kind of a dupe, but way leaner!