Update watch file format version to 4

Update watch file format version to 4. (older-debian-watch-file-standard)

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Build and test logs for this branch can be found at https://janitor.debian.net/lintian-fixes/pkg/ocaml-alsa/4ff9c129-748f-41e4-9a1c-c383ffc3a7a4.

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/4d/562702ffcd87c4fb99470766a77baf1e9e042e.debug
-rw-r--r--  root/root   /usr/lib/debug/.build-id/62/9e2a73a47568c6db8618b0f7e9e0730812118f.debug

Files in first set of .debs but not in second

-rw-r--r--  root/root   /usr/lib/debug/.build-id/8a/36d05f0e316e203f2fdf398d0b607b7215b434.debug
-rw-r--r--  root/root   /usr/lib/debug/.build-id/96/791a76cf653b38ed1a9f74b5d585fccd7d7cde.debug

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

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

• Build-Ids: 8a36d05f0e316e203f2fdf398d0b607b7215b434 96791a76cf653b38ed1a9f74b5d585fccd7d7cde 4d562702ffcd87c4fb99470766a77baf1e9e042e 629e2a73a47568c6db8618b0f7e9e0730812118f

No differences were encountered between the control files of package **libalsa-ocaml-dev**

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