Move Debian changelog entries to rc2 since rc1 was not published

debian/changelog

 matrix-synapse-py3 (1.47.0~rc2) stable; urgency=medium
 
-  * New synapse release 1.47.0~rc2.
-
- -- Synapse Packaging team <packages@matrix.org>  Wed, 10 Nov 2021 09:41:01 +0000
-
-matrix-synapse-py3 (1.47.0~rc1) stable; urgency=medium
-
   [ Dan Callahan ]
   * Update scripts to pass Shellcheck lints.
   * Remove unused Vagrant scripts from debian/ directory.
@@ -13,7 +7,10 @@ matrix-synapse-py3 (1.47.0~rc1) stable; urgency=medium
   * Preinstall the "wheel" package when building virtualenvs.
   * Do not error if /etc/default/matrix-synapse is missing.
 
- -- Synapse Packaging team <packages@matrix.org>  Tue, 09 Nov 2021 12:16:43 +0000
+  [ Synapse Packaging team ]
+  * New synapse release 1.47.0~rc2.
+
+ -- Synapse Packaging team <packages@matrix.org>  Wed, 10 Nov 2021 09:41:01 +0000
 
 matrix-synapse-py3 (1.46.0) stable; urgency=medium