Update packaging vendor news

news/packaging.vendor.rst

@@ -1 +1,7 @@
-Upgrade packaging to 24.2
+Upgrade packaging to 24.2. This version introduces a behavior change for
+pre-release specifiers that use `<` or `>`. Previously, including a
+pre-release version did not imply that pre-release versions should be
+accepted. However, now it does. For example, `<2.0dev` will now include
+`1.0rc1`. If you do not want to include pre-release versions, avoid
+specifying pre-releases in your specifier. For instance, use `<2.0`.
+The only exception is `!=`, which will never imply pre-releases.