Replace gem install with bundle install in CI
What does this merge request do and why?
This MR replaces gem install with bundle install in CI.
Related to #2182 (comment 2038914871)
Impacted categories
The following categories relate to this merge request:
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gdk-reliability - e.g. When a GDK action fails to complete. -
gdk-usability - e.g. Improvements or suggestions around how the GDK functions. -
gdk-performance - e.g. When a GDK action is slow or times out.
Merge request checklist
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This change is backward compatible. If not, please include steps to communicate to our users. -
Tests added for new functionality. If not, please raise an issue to follow-up. -
Documentation added/updated, if needed. -
Announcement added, if change is notable. -
gdk doctortest added, if needed. -
Add the ~highlightlabel if this MR should be included in theCHANGELOG.md.