Fix some issues reported by lintian

Fix some issues reported by lintian

• Bump debhelper from old 11 to 12. (package-uses-old-debhelper-compat-version)
• Set debhelper-compat version in Build-Depends. (uses-debhelper-compat-file)
• Set upstream metadata fields: Repository, Repository-Browse.
• Remove obsolete field Name from debian/upstream/metadata (already present in machine-readable debian/copyright).

This merge proposal was created automatically by the Janitor bot.

You can follow up to this merge proposal as you normally would.

Build and test logs for this branch can be found at https://janitor.debian.net/lintian-fixes/pkg/python-cpl/3f0e434c-5ba7-476c-bcf3-8b2739b0f2cb.

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 .changes but not in first

-rw-r--r--  root/root   /usr/lib/debug/.build-id/04/9759cd006a498fc5a3511d14d64139365c8cb3.debug
-rw-r--r--  root/root   /usr/lib/debug/.build-id/b2/5c5cde921392155f97998d99d41f3735204ff2.debug
-rw-r--r--  root/root   /usr/lib/debug/.dwz/x86_64-linux-gnu/python3-cpl.debug

Files in first .changes but not in second

-rw-r--r--  root/root   /usr/lib/debug/.build-id/0c/a63932fce682b028e092cbe5f724fe6ad942c3.debug
-rw-r--r--  root/root   /usr/lib/debug/.build-id/cc/4866de6d6c56bceebfbaa90d6e5a3ad8ba6785.debug

No differences were encountered between the control files of package **python3-cpl**

Control files of package python3-cpl-dbgsym: lines which differ (wdiff format)

• Build-Ids: 0ca63932fce682b028e092cbe5f724fe6ad942c3 cc4866de6d6c56bceebfbaa90d6e5a3ad8ba6785 049759cd006a498fc5a3511d14d64139365c8cb3 b25c5cde921392155f97998d99d41f3735204ff2

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