fix(ci): update apt cache on linux runner

Author: andybrwr

.fleet/run.json

@@ -32,7 +32,9 @@ jobs:
 
       - name: Install Linux deps
         if: runner.os == 'Linux'
-        run: sudo apt-get install libgtk-3-dev libwebkit2gtk-4.0-dev
+        run: |
+          sudo apt-get update
+          sudo apt-get install libgtk-3-dev libwebkit2gtk-4.0-dev
 
       - name: Install NSIS
         if: runner.os == 'Windows'