ci: Use go 1.26 rather than 1.24

Signed-off-by: Stefan Berger <stefanb@linux.vnet.ibm.com>

Author: stefanberger

.github/workflows/ci.yml

@@ -66,7 +66,7 @@ jobs:
   tests:
     strategy:
       matrix:
-        go: ["1.24", "1.25"]
+        go: ["1.26", "1.25"]
         os: [ubuntu-22.04, windows-2022]
 
     name: Tests / ${{ matrix.os }} / ${{ matrix.go }}