Merge branch 'jk/httpd-test-updates'

Test update. * jk/httpd-test-updates: t/lib-httpd: increase ssl key size to 2048 bits t/lib-httpd: drop SSLMutex config t/lib-httpd: bump required apache version to 2.4 t/lib-httpd: bump required apache version to 2.2 This is a backport onto the `maint-2.39` branch, to improve the CI health of that branch. Signed-off-by: Johannes Schindelin <Johannes.Schindelin@gmx.de>