debian: bump debian/compat to 10

Bump debian/compat to 10 since 9 is deprecated. Bump minimal required
debhelper to 10 (except for Ubuntu Trusty and Xenial) since it is the
recommended practice for compatibility level setup.

Closes #6393

changelogs/unreleased/gh-6393-bump-debian-compat.md

+## feature/build
+
+* Bump debian package compatibility level to 10 (gh-5429).
+
+  Bump minimal required debhelper to version 10 (except for Ubuntu Xenial).
\ No newline at end of file

debian/compat

-9
+10

debian/control

@@ -3,6 +3,10 @@ Priority: optional
 Maintainer: Alexander Turenko <alexander.turenko@tarantool.org>
 Uploaders: Dmitry E. Oboukhov <unera@debian.org>
 Build-Depends: cdbs (>= 0.4.100), debhelper (>= 9), dpkg-dev (>= 1.16.1~),
+# It is recommended to use debhelper version equal to or greater than
+# compatibility level. This is a workaround for Ubuntu Xenial repos
+# missing debhelper 10.
+ base-files (<< 9.9) | debhelper (>= 10),
 # Enable systemd for Debian Jessie+ and Ubuntu Wily+
  debhelper (>= 9.20160709) | dh-systemd (>= 1.22) | sysvinit (<< 2.88dsf-59) | upstart (<< 1.13),
 # XXX: This is a tiny hack to support Tarantool build on the old