Fix git installation command in CI workflow

Author: tobiasdiez

.github/workflows/ci.yml

@@ -43,7 +43,7 @@ jobs:
         run: |
           SYSTEM=$(build/bin/sage-guess-package-system)
           if [ "$SYSTEM" = "fedora" ]; then
-              dnf install git
+              dnf install -y git
 
               # Need to use --setopt=tsflags="" to avoid errors with gphelp
               dnf install -y pari-gp --setopt=tsflags=""