Update vk-gl-cts-nightly.yml (shader-slang#4214)

Increase timeout from 100 to 180 minutes

Author: cheneym2

.github/workflows/vk-gl-cts-nightly.yml

@@ -11,7 +11,7 @@ env:
 jobs:
   build:
     runs-on: [Windows, self-hosted]
-    timeout-minutes: 100
+    timeout-minutes: 180
     continue-on-error: true
     steps:
     - uses: actions/checkout@v4