Fix some issues reported by lintian

Fix some issues reported by lintian

• Bump debhelper from deprecated 9 to 13. (package-uses-deprecated-debhelper-compat-version)

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

This merge proposal was created automatically by the Janitor bot. For more information, including instructions on how to disable these merge proposals, see https://janitor.debian.net/lintian-fixes.

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Build and test logs for this branch can be found at https://janitor.debian.net/lintian-fixes/pkg/partman-efi/5d7e774b-1e4e-40f4-a7d4-067f70506eed.

These changes have no impact on the binary debdiff.

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