revert: restore the unpinned devcontainer base reference

Author: robarnold

.devcontainer/Containerfile

@@ -15,7 +15,7 @@ COPY --chmod=0755 --from=kustomize /app/kustomize /usr/local/bin/kustomize
 
 RUN echo 'vscode ALL=(ALL) NOPASSWD:ALL' > /etc/sudoers.d/vscode \
     && chmod 0440 /etc/sudoers.d/vscode \
-    && sed -i 's/^account    include      system-auth$/account    sufficient   pam_permit.so\\n&/' /etc/pam.d/sudo
+    && sed -i 's/^account    include      system-auth$/account    sufficient   pam_permit.so\n&/' /etc/pam.d/sudo
 
 RUN --mount=type=bind,from=ctx,source=/,target=/ctx \
     --mount=type=cache,dst=/var/cache \