Fix some issues reported by lintian

See merge request !15

Changes-By: lintian-brush
Fixes: lintian: uses-debhelper-compat-file
See-also: https://lintian.debian.org/tags/uses-debhelper-compat-file.html

+ Use dh_installsystemd rather than deprecated dh_systemd_enable.
+ Use dh_installsystemd rather than deprecated dh_systemd_start.

Changes-By: lintian-brush
Fixes: lintian: package-uses-old-debhelper-compat-version
See-also: https://lintian.debian.org/tags/package-uses-old-debhelper-compat-version.html

Changes-By: lintian-brush
Fixes: lintian: package-lacks-versioned-build-depends-on-debhelper
See-also: https://lintian.debian.org/tags/package-lacks-versioned-build-depends-on-debhelper.html

Fix some issues reported by lintian

See merge request !14

Changes-By: lintian-brush
Fixes: lintian: debian-changelog-has-wrong-day-of-week
See-also: https://lintian.debian.org/tags/debian-changelog-has-wrong-day-of-week.html

Changes-By: lintian-brush
Fixes: lintian: missing-built-using-field-for-golang-package
See-also: https://lintian.debian.org/tags/missing-built-using-field-for-golang-package.html

Changes-By: lintian-brush
Fixes: lintian: debian-rules-uses-unnecessary-dh-argument
See-also: https://lintian.debian.org/tags/debian-rules-uses-unnecessary-dh-argument.html

Changes-By: lintian-brush
Fixes: lintian: trailing-whitespace
See-also: https://lintian.debian.org/tags/trailing-whitespace.html

Update module github.com/prometheus/client_golang to v1.11.0

See merge request !11

Update golang.org/x/crypto commit hash to 5ea612d

See merge request !7

Update module miekg/dns to v1.1.40

See merge request !9

Update module miekg/dns to v1.1.39

See merge request !8

Update module miekg/dns to v1.1.38

See merge request !6

Update module miekg/dns to v1.1.37

See merge request !5

Update module miekg/dns to v1.1.35

See merge request !3

Update module yaml to v2.4.0

See merge request !4

Configure Renovate

See merge request !2

This is useful for, e.g. OCSP stapling.

Switch to certbot pem names

See merge request !1

Easier to swap between the two.