Fix some issues reported by lintian

See merge request mariadb-team/galera-3!5

Fixes lintian: field-name-typo-dep5-copyright
See https://lintian.debian.org/tags/field-name-typo-dep5-copyright.html for more details.

+ debian/rules: Call dh_missing rather than using dh_install --list-missing.

Fixes lintian: package-uses-old-debhelper-compat-version
See https://lintian.debian.org/tags/package-uses-old-debhelper-compat-version.html for more details.

Fixes lintian: out-of-date-standards-version
See https://lintian.debian.org/tags/out-of-date-standards-version.html for more details.

Fixes lintian: debian-watch-uses-insecure-uri
See https://lintian.debian.org/tags/debian-watch-uses-insecure-uri.html for more details.

Update to upstream version '25.3.28'
with Debian dir a8949f85d7cce976baa2f865cd676077851e9cd5

This was consistently failing in reprotest builds. Since upstream developer
reported this test can fail e.g. due race condition on a congested build
machine, the test itself cannot be fixed easily and for Debian packaging
purposes the best solution right now it to selectively disable just this
test suite.

With this and previous commit the package is now compliant with the latest
Debian policy version 4.4.0.

See https://lintian.debian.org/tags/incomplete-creative-commons-license.html

Update to upstream version '25.3.27'
with Debian dir b6c7359c96fedd25438dc20f8a3542d5e77b3052

Source: https://github.com/codership/galera/issues/539

Update to upstream version '25.3.26'
with Debian dir 072b600f5d1c38f63249c526d3659ae8a765db1d

Update Salsa CI pipeline

See merge request mariadb-team/galera-3!4

Hopefully fix FTBFS on mipsel.

See merge request mariadb-team/galera-3!3

It might be necessary to further raise the multiplier if
this one (2) is insufficient.

Update to upstream version '25.3.25'
with Debian dir 3b290bbf71b27f26aed09a83d0158ac406f16e5c

See https://salsa.debian.org/salsa-ci-team/dummypackage/tree/master/debian