Remove unnecessary pacman git install from CI workflow

Git is already available in the runner image.

.gitea/workflows/update-pkgver.yaml

@@ -12,9 +12,6 @@ jobs:
   update-pkgver:
     runs-on: moonarch
     steps:
-      - name: Install dependencies
-        run: pacman -Sy --noconfirm git
-
       - name: Checkout source repo
         run: |
           git clone --bare http://gitea:3000/nevaforget/moonset.git source.git