fix broken debian-package-build Evergreen task

Author: rcsanchez97

.evergreen/debian_package_build.sh

@@ -32,7 +32,6 @@ fi
 cd ..
 
 git clone https://salsa.debian.org/installer-team/debootstrap.git debootstrap.git
-mkdir unstable-chroot
 export DEBOOTSTRAP_DIR=`pwd`/debootstrap.git
 # perl-openssl-defaults is explicitly listed to work around https://bugs.debian.org/907015
 sudo -E ./debootstrap.git/debootstrap --include=build-essential,perl-openssl-defaults,git-buildpackage,fakeroot,debhelper,cmake,libssl-dev,pkg-config,python3-sphinx,zlib1g-dev,libicu-dev,libsasl2-dev,libsnappy-dev,libzstd-dev unstable ./unstable-chroot/ http://cdn-aws.deb.debian.org/debian