fix: switch location of multiapp plugin of cf

[lechnerc77]

Purpose

• Fix build error due to change of CF plugin url

Does the PR solve an issue

[ ] Yes - Please add issue number
[X] No

Does this introduce a breaking change?

[ ] Yes
[X] No

Pull Request Type

What kind of change does this Pull Request introduce?

[X] Bugfix
[ ] Feature
[ ] Code style update (formatting, local variables)
[ ] Refactoring (no functional changes, no api changes)
[ ] Documentation content changes
[ ] Other... Please describe:

How to Test

Build Docker image

What to Check

Dokcer image can be built successfully

Other Information

n/a