Fix Clippy Lints

[alexmaco]

This Pull Request fixes the current CI failures

It changes the following:

• applies latest nightly clippy lints
• disables clippy::missing_const_for_fn due to hight number of false positives on nightly

I followed the checklist:

• [ ] I added unittests
• [x] I ran make check without errors
• [x] I tested the overall application
• [ ] I added an appropriate item to the changelog