Fix ConcurrentModificationException #6732

[neugartf]

Could be nicer with jdk > 8, but that's how it is :). I added a filter to make sure only string key/values from Properties are read into our logic.

[linux-foundation-easycla[bot]]

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• :white_check_mark: login: neugartf / name: Fabian Neugart (b115c5a6e2f469f437026fad2319ae4588b60cd0, ab8447079fe9efda828cdef2fe810d4c0027ab7e, af488636cc61f791704f39a47439fb6c4262cb24, 329c05d88da9c76a97443cd51afccf71a432957c)

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 90.07%. Comparing base (697b4e0) to head (329c05d).

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #6746 +/- ## ============================================ - Coverage 90.08% 90.07% -0.01% + Complexity 6464 6463 -1 ============================================ Files 718 718 Lines 19528 19529 +1 Branches 1923 1923 ============================================ Hits 17591 17591 - Misses 1348 1350 +2 + Partials 589 588 -1 ```

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