Tagging the 4.9.0 release.

Merge pull request #1617 from nextcloud/release/v4.8.0

v4.8.0

Merge pull request #1584 from nextcloud/release/v4.7.5

v4.7.5

Merge pull request #1574 from nextcloud/release/v4.7.4

v4.7.4

Merge pull request #1558 from nextcloud/release-4.7.2

chore: 4.7.2

Merge pull request #1553 from nextcloud/release/v4.7.1

chore: 4.7.1

Merge pull request #1541 from nextcloud/release-4.7.0

chore: 4.7.0

Merge pull request #1430 from nextcloud/chore/bump-version

chore: bump version

Merge pull request #1410 from nextcloud/email-change-tweaks