bump to v2.18.0 (#2118)

Co-authored-by: Peter Baus <peter.baus@accenture.com>

bump to v2.17.0 (#2092)

bump to v2.16.0 (#2009)

Merge pull request #1986 from openkfw/bump-to-v2.15.0

bump to v2.15.0

bump to v2.14.0 (#1934)

Merge pull request #1926 from openkfw/bump-to-v2.13.0

bump to v2.13.0

Merge pull request #1890 from openkfw/bump-to-v2.12.0

bump to version 2.12.0

Merge pull request #1856 from openkfw/bump-to-v2.11.0

bump to v2.11.0

bump to v2.10.0 (#1805)

bump to v2.9.0 (#1746)