fix: avoid misleading messages during update

[Abdul-Rafy2005]

This fixes issue #2609.

Problem

When jbang version --update is executed, the update flow bypasses the normal version comparison and later triggers the standard version notification. As a result, users are told to run jbang version --update even though they just did.

Additionally, when JBang is already on the latest version, the command unnecessarily attempts an update instead of informing the user that it is already up to date.

Fix

This change always compares the installed version with the latest version, reports when the installation is already up to date, and suppresses the redundant notification after a successful update.

Result

• No misleading "Run jbang version --update" message after an update.
• Users are informed when they already have the latest version.
• Existing version-check behavior remains unchanged.

Fixes #2609

[coderabbitai]

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