Update KLayout requirement to version 0.29.8 #276

Job	Run time
Shellcheck	3s
Static code analysis	1m 14s
Check license	4s
Check copyright headers	6s
Tests (klayout27)	1m 13s
Tests (non-🐧) (windows-latest, klayout27)	1m 58s
Tests (klayout28)	1m 9s
Verify documentation	2m 30s
Verify layer properties	31s
Tests (non-🐧) (windows-latest, klayout28)	2m 2s
Tests (latest)	1m 2s
Tests (non-🐧) (windows-latest, latest)	2m 23s
Tests (non-🐧) (macos-latest, klayout27)	12m 11s
Tests (non-🐧) (macos-latest, klayout28)	55s
Tests (non-🐧) (macos-latest, latest)	53s
Deploy documentation	22s
Publish test results	9s
Build & Publish kqcircuits 🐍 📦	48s
	29m 33s

Provide feedback