release(v0.49.0): prepare release

This is the official v0.49.0 release.

Signed-off-by: Artem Chernyshev <[email protected]>

Author: Unix4ever

.kres.yaml

@@ -553,7 +553,7 @@ spec:
         Licensor: Sidero Labs, Inc.
         LicensedWork: Omni
         Copyright: (c) 2025 Sidero Labs, Inc.
-        ChangeDate: "2029-04-03"
+        ChangeDate: "2029-05-06"
         ChangeLicense: Mozilla Public License, version 2.0
         EnterpriseLink: https://www.siderolabs.com/contact/
       header: |