Fix some issues reported by lintian

Fix some issues reported by lintian

• Bump debhelper from old 11 to 13. (package-uses-old-debhelper-compat-version)

• Set debhelper-compat version in Build-Depends. (uses-debhelper-compat-file)

• Set upstream metadata fields: Bug-Database, Bug-Submit, Repository-Browse. (upstream-metadata-file-is-missing, upstream-metadata-missing-bug-tracking)

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Build and test logs for this branch can be found at https://janitor.debian.net/lintian-fixes/pkg/picocom/204f6738-8509-4743-9c2c-15d685e41b69.

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/0f/e60ed69c4e91bd4b02c5749291c0e614b56ddd.debug

Files in first set of .debs but not in second

-rw-r--r--  root/root   /usr/lib/debug/.build-id/a2/e8c8597546671d9b364855f1a13e041641f23b.debug

Control files of package picocom: lines which differ (wdiff format)

• Depends: libc6 (>= 2.33) 2.34)

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

• Build-Ids: a2e8c8597546671d9b364855f1a13e041641f23b 0fe60ed69c4e91bd4b02c5749291c0e614b56ddd

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