Fix some issues reported by lintian

Fix some issues reported by lintian

• Update watch file format version to 4. (older-debian-watch-file-standard)
• Set debhelper-compat version in Build-Depends. (uses-debhelper-compat-file)
• Update standards version to 4.6.2, no changes needed. (out-of-date-standards-version)

Debdiff

These changes affect the binary packages:

[The following lists of changes regard files as different if they have different names, permissions or owners.]

Files in second set of .debs but not in first

-rw-r--r--  root/root   /usr/lib/debug/.build-id/49/6bdf7ca6936afc11c28c7acf35385f123b937f.debug

Files in first set of .debs but not in second

-rw-r--r--  root/root   /usr/lib/debug/.build-id/1d/8dcdb7ea59d3a43d6bd91de5404516e1b200c5.debug

Control files of package libcalendar-ocaml: lines which differ (wdiff format)

• Provides: libcalendar-ocaml-cx677 libcalendar-ocaml-ux1d8

Control files of package libcalendar-ocaml-dbgsym: lines which differ (wdiff format)

• Build-Ids: 1d8dcdb7ea59d3a43d6bd91de5404516e1b200c5 496bdf7ca6936afc11c28c7acf35385f123b937f

Control files of package libcalendar-ocaml-dev: lines which differ (wdiff format)

• Depends: ocaml-findlib, libcalendar-ocaml-cx677, libcalendar-ocaml-ux1d8, ocaml-4.13.1
• Provides: libcalendar-ocaml-dev-cx677 libcalendar-ocaml-dev-ux1d8

No differences were encountered between the control files of package **libcalendar-ocaml-doc**

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Build and test logs for this branch can be found at https://janitor.debian.net/lintian-fixes/pkg/calendar/31f505ff-004b-4e5e-bab6-8546da84269e.