definitions: Lintian-ignore changed-by-invalid-for-derivative

The ci adds a changelog entry that doesn't match the current
requirements

  changed-by-invalid-for-derivative Librem5 CI <librem5-builds@lists.community.puri.sm> (should use @puri.sm email addresses)

but these look too tight anyway, see

    https://tracker.pureos.net/T1075

so lets keep the mailing list as go-to point and suppress the error for
now.
13 jobs for lintian-error in 3 minutes and 19 seconds (queued for 2 seconds)
Status Job ID Name Coverage
  Test
passed #366423
librem5
test:native

00:00:11

 
  Package
passed #366427
librem5
package-debian-bullseye

00:00:39

passed #366425
librem5
package-debian-buster

00:00:39

passed #366424
librem5
package-pureos-amber

00:00:40

passed #366426
librem5
package-pureos-byzantium

00:00:41

 
  Test Package
passed #366434
librem5
autopkgtest-debian-bullseye-package

00:00:32

passed #366430
librem5
autopkgtest-debian-buster-package

00:00:29

passed #366428
librem5
autopkgtest-pureos-amber-package

00:00:41

passed #366432
librem5
autopkgtest-pureos-byzantium-package

00:00:56

passed #366435
librem5
lintian-debian-bullseye-package

00:00:38

passed #366431
librem5
lintian-debian-buster-package

00:00:35

passed #366429
librem5
lintian-pureos-amber-package

00:00:39

passed #366433
librem5
lintian-pureos-byzantium-package

00:00:46