Changes: pre-release housekeeping

CHANGES

@@ -7,7 +7,7 @@ contributors are listed. Note that Calamares does not have a historical
 changelog -- this log starts with version 3.2.0. The release notes on the
 website will have to do for older versions.
 
-# 3.2.40 (unreleased) #
+# 3.2.40 (2021-07-14) #
 
 This release contains contributions from (alphabetically by first name):
  - Anke Boersma

CMakeLists.txt

@@ -45,7 +45,7 @@ project( CALAMARES
     LANGUAGES C CXX
 )
 
-set( CALAMARES_VERSION_RC 1 )  # Set to 0 during release cycle, 1 during development
+set( CALAMARES_VERSION_RC 0 )  # Set to 0 during release cycle, 1 during development
 
 ### OPTIONS
 #