Revert "chore: release main (#1962)"

This reverts commit c77112b.
Signed-off-by: Gregor Zeitlinger <[email protected]>

Author: zeitlinger

.github/config/.release-please-manifest.json

@@ -1,3 +1,3 @@
 {
-  ".": "1.6.0"
+  ".": "1.5.0"
 }