fix: password in console

[sosa-vaadin]

There's an instruction for upgrading Control Center in which we recommend writing a password value into the terminal. This PR changes this insecure practice to use a reference to a file containing the password instead.

[github-actions]

AI Language Review

The modifications in the Upgrading documentation file include important updates, specifically in the section about creating a secret for Control Center user credentials. A warning was added regarding the handling of sensitive information which is a significant improvement for security awareness. However, in the warning, the phrasing could be improved for clarity. The phrase "stored in the terminal command history" suggests avoiding storage, but it could be clearer by suggesting readers to use configuration files instead. The warning can be more precise and concise.

The line "Replace the example values with your own email address and the path to your password file." does not require changes as it accurately provides instruction.

No other modified lines require improvements.

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❌ heruan
❌ sosa-vaadin
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