runtime(debian): update debian related runtime files (#13423)

* Update Debian runtime files

Add mantic as a supported Ubuntu release and move buster/kinetic to
unsupported.

Add syntax highlighting for deb822sources filetype.

Add debsources ftplugin to set relevant comment options.

Move common version information to shared/debversions.vim

Closes #11934

Co-authored-by: Heinrich Schuchardt <heinrich.schuchardt@canonical.com>
Co-authored-by: James Addison <jay@jp-hosting.net>
Co-authored-by: Viktor Szépe <viktor@szepe.net>
Signed-off-by: James McCoy <jamessan@jamessan.com>

* Add myself as codeowner for Debian-related runtime files

Signed-off-by: James McCoy <jamessan@jamessan.com>

---------

Signed-off-by: James McCoy <jamessan@jamessan.com>
Co-authored-by: Heinrich Schuchardt <heinrich.schuchardt@canonical.com>
Co-authored-by: James Addison <jay@jp-hosting.net>
Co-authored-by: Viktor Szépe <viktor@szepe.net>
Signed-off-by: Christian Brabandt <cb@256bit.org>
diff --git a/.github/CODEOWNERS b/.github/CODEOWNERS
index ccb36b3..cd64800 100644
--- a/.github/CODEOWNERS
+++ b/.github/CODEOWNERS
@@ -124,6 +124,9 @@
 runtime/ftplugin/csh.vim		@dkearns
 runtime/ftplugin/css.vim		@dkearns
 runtime/ftplugin/cucumber.vim		@tpope
+runtime/ftplugin/debchangelog.vim	@jamessan
+runtime/ftplugin/debcontrol.vim		@jamessan
+runtime/ftplugin/debsources.vim		@jamessan
 runtime/ftplugin/desktop.vim		@e-kwsm
 runtime/ftplugin/dosbatch.vim		@mrdubya
 runtime/ftplugin/eiffel.vim		@dkearns
@@ -357,6 +360,12 @@
 runtime/syntax/dart.vim			@pr3d4t0r
 runtime/syntax/datascript.vim		@dpelle
 runtime/syntax/dcl.vim			@cecamp
+runtime/syntax/deb822sources.vim	@jamessan
+runtime/syntax/debchangelog.vim		@jamessan
+runtime/syntax/debcontrol.vim		@jamessan
+runtime/syntax/debcopyright.vim		@jamessan
+runtime/syntax/debsources.vim		@jamessan
+runtime/syntax/dep3patch.vim		@jamessan
 runtime/syntax/desktop.vim		@e-kwsm
 runtime/syntax/dosbatch.vim		@mrdubya
 runtime/syntax/dosini.vim		@xuhdev
@@ -479,6 +488,7 @@
 runtime/syntax/sdoc.vim			@gpanders
 runtime/syntax/sed.vim			@dkearns
 runtime/syntax/sh.vim			@cecamp
+runtime/syntax/shared/debversions.vim	@jamessan
 runtime/syntax/sm.vim			@cecamp
 runtime/syntax/solidity.vim		@cothi
 runtime/syntax/spec.vim			@ignatenkobrain