Update GDK in Gitpod workspace

What does this MR do and why?

This MR runs the gdk update within the Gitpod workspace. Previously, we only ran gdk reconfigure, which worked because it included duplicated commands from gdk update. But, now that there are no more duplicated commands between gdk update and gdk reconfigure, it is necessary to run this command in the Gitpod workspace.

This command ensures that the workspace is updated with the latest changes in GDK project, removing the need to run gdk update manually when the workspace is opened.

Related to gitlab-development-kit#1836 (closed).

MR acceptance checklist

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