github: add missing dep

Signed-off-by: Jared Van Bortel <[email protected]>

Author: cebtenzzre

Diff for: .github/workflows/lint.yml

@@ -27,7 +27,7 @@ jobs:
       - name: Install dependencies
         run: |
           sudo apt-get update
-          sudo apt-get install qt6-base-private-dev qt6-declarative-dev qt6-httpserver-dev qt6-tools-dev qt6-websockets-dev
+          sudo apt-get install qt6-base-private-dev qt6-declarative-dev qt6-httpserver-dev qt6-pdf-dev qt6-tools-dev qt6-websockets-dev
       - name: Configure
         run: |
           cmake -S gpt4all-chat -B gpt4all-chat/build \