Fix CI with running trunk version

[kdauer]

Summary

The CI runs with all test on Squeak64-trunk and at the moment it fails.

Steps to reproduce

• enable Squeak64-trunk in github workflows again

current behavior

• the CI fails

expected behavior

• the CI runs through all the time

Possible fixes

• check for startsWithbecause it's deprecated
• check for Increase Font Size and replace with increase font size (+)
• check for Set High DPI Modeand disable it?