chore: Update NOTICE copyright year to 2026

Bump the end year in the NOTICE copyright range to 2026
to reflect the current calendar year

PR: #25
Signed-off-by: vaccel-bot[bot] <175908213+vaccel-bot[bot]@users.noreply.github.com>
Reviewed-by: Kostis Papazafeiropoulos <papazof@gmail.com>
Approved-by: Kostis Papazafeiropoulos <papazof@gmail.com>

Author: vaccel-bot[bot]

NOTICE

@@ -1,5 +1,5 @@
 vAccel Go bindings
-Copyright 2020-2025 Nubificus LTD. or its affiliates. All Rights Reserved.
+Copyright 2020-2026 Nubificus LTD. or its affiliates. All Rights Reserved.
 
 This product includes software developed at Nubificus LTD
 (https://www.nubificus.co.uk)