Fix cloudflare pages asdf workaround

[ghost]

Trying to deploy with the current asdf command gives me this error:

23:47:45.659	Executing user command: zola build
23:47:45.899	Building site...
23:47:45.904	Error: Failed to build the site
23:47:45.904	Error: Error parsing templates from the /templates directory
23:47:45.904	Error: Reason: Io error while writing rendered value to output: NotFound
23:47:45.904	Error: Reason: No such file or directory (os error 2)
23:47:45.906	Failed: Error while executing user command. Exited with error code: 1
23:47:45.915	Failed: build command exited with code: 1
23:47:46.837	Failed: error occurred while running build command

Changing the command to use the latest version, 0.18.0, fixed this.

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