release Spot 2.12.2

* configure.ac, doc/org/setup.org: Bump version to 2.12.2.
* bin/common_setup.cc, debian/copyright: Bump copyright year to 2025.
* NEWS: Update.

NEWS

@@ -1,6 +1,6 @@
-New in spot 2.12.1.dev  (not yet released)
+New in spot 2.12.2  (2025-01-18)
 
-  Nothing yet.
+  Bug fixes:
 
   - to_finite() was dealing incorrectly with edges that were
     both alive and dead.  (Issue #596.)
@@ -8,6 +8,11 @@ New in spot 2.12.1.dev  (not yet released)
   - LaTeX output of the X[!] operator with broken in both
     LaTeX and self-contained LaTeX mode.  (Issue #597)
 
+  - Fix a bug in the AIGER encoding with certain forms of
+    global-equivalence.
+
+  - Work around a spurious test failure with Python 3.13.
+
 New in spot 2.12.1  (2024-09-23)
 
   Bug fixes: