Minor fixes found during release (#3541)

ndokos · web-flow · commit 7bd2a1a6acd6 · 2023-08-30T18:45:28.000-04:00
* Change the jenkins/branch.name file

It now contains `b0.73` in this branch.

* Fix the version: 0.73.0

That will change the SHA1 sum in the RPM label - sigh.
diff --git a/agent/VERSION b/agent/VERSION
@@ -1 +1 @@
-0.73
+0.73.0
diff --git a/jenkins/branch.name b/jenkins/branch.name
@@ -1 +1 @@
-main
+b0.73
