Steven Clark a10685c521
Pin curl docker image to a specific docker version instead of latest (#23763)
- Try to avoid these build failures as our proxy does seem to have
   issues around pulling images with the 'latest' tag at times.

```
acme_test.go:206:
	Error Trace:	/home/runner/actions-runner/_work/vault-enterprise/vault-enterprise/builtin/logical/pkiext/pkiext_binary/acme_test.go:206
          	        /home/runner/actions-runner/_work/vault-enterprise/vault-enterprise/builtin/logical/pkiext/pkiext_binary/acme_test.go:75
	Error:      	Received unexpected error:
				container create failed: Error response from daemon: No such image: docker.mirror.hashicorp.services/curlimages/curl:latest
	Test:       	Test_ACME/group/caddy_http_eab
	Messages:   	could not start cURL container
```
2023-10-24 10:04:23 -04:00
..