Revert "Use pikaur-git"

This reverts commit 7c42d2f.

Dockerfile

@@ -25,7 +25,7 @@ RUN echo -e "keyserver-options auto-key-retrieve" >> /etc/pacman.d/gnupg/gpg.con
     pacman --noconfirm -S --needed git && \
     echo "%wheel ALL=(ALL) NOPASSWD: ALL" >> /etc/sudoers && \
     useradd build -G wheel -m && \
-    su - build -c "git clone https://aur.archlinux.org/pikaur-git.git /tmp/pikaur" && \
+    su - build -c "git clone https://aur.archlinux.org/pikaur.git /tmp/pikaur" && \
     su - build -c "cd /tmp/pikaur && makepkg -f" && \
     pacman --noconfirm -U /tmp/pikaur/pikaur-*.pkg.tar.zst