build/aur: add Git as flux-scm build dependency

Without git installed, makepkg fails to fetch the source. This breaks
the build for people who build their aur packages inside temporary
containers (for example aurutils with the -c flag).

Signed-off-by: Tom Alexander <tom@fizz.buzz>

.github/aur/flux-scm/PKGBUILD.template

@@ -11,7 +11,7 @@ license=("APACHE")
 provides=("flux-bin")
 conflicts=("flux-bin")
 depends=("glibc")
-makedepends=('go>=1.17', 'kustomize>=3.0')
+makedepends=('go>=1.17', 'kustomize>=3.0', 'git')
 optdepends=('bash-completion: auto-completion for flux in Bash',
 'zsh-completions: auto-completion for flux in ZSH')
 source=(