Fix to work with Unity 6

[nowsprinting]

Changes

• Mod run tests Unity version matrix, Add Unity 6
• Fix to work with Unity 6

[github-actions]

Code Metrics Report

	master (de30891)	#53 (3f237e0)	+/-
Coverage	16.2%	16.2%	0.0%
Code to Test Ratio	1:1.5	1:1.5	-0.1
Test Execution Time	4m22s	2m36s	-1m46s

Details

  |                     | master (de30891) | #53 (3f237e0) |  +/-   |
  |---------------------|------------------|---------------|--------|
  | Coverage            |            16.2% |         16.2% |   0.0% |
  |   Files             |                4 |             4 |      0 |
  |   Lines             |              129 |           129 |      0 |
  |   Covered           |               21 |            21 |      0 |
- | Code to Test Ratio  |            1:1.5 |         1:1.5 |   -0.1 |
  |   Code              |              232 |           236 |     +4 |
  |   Test              |              359 |           359 |      0 |
+ | Test Execution Time |            4m22s |         2m36s | -1m46s |

Code coverage of files in pull request scope (0.0% → 0.0%)

Files	Coverage	+/-
Editor/DoCreateScriptFoldersWithTests.cs	0.0%	0.0%

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Reported by octocov