Update CI image to released 1.26 ver

Author: tsmith023

.github/workflows/main.yaml

@@ -9,7 +9,7 @@ on:
 env:
   WEAVIATE_124: 1.24.21
   WEAVIATE_125: 1.25.8
-  WEAVIATE_126: preview--caba86b
+  WEAVIATE_126: 1.26.0
 
 jobs:
   checks: