Update to drawio 20.2.8

[bollwyvl]

Changes

• [x] drawio 20.2.8
• [ ] prep #101 docs updates

[codecov[bot]]

Codecov Report

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

Project coverage is 97.12%. Comparing base (c46023d) to head (049b634).

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #102 +/- ## ======================================= Coverage 97.12% 97.12% ======================================= Files 21 21 Lines 730 730 Branches 91 91 ======================================= Hits 709 709 Misses 12 12 Partials 9 9 ```

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