adding 1.26.0-rc2 to git template (cloudnative-pg#7430)

fixes cloudnative-pg#7429

Signed-off-by: Daniel Chambre <smiyc@pm.me>

Signed-off-by: Daniel Chambre <smiyc@pm.me>

Author: smiyc

.github/ISSUE_TEMPLATE/bug.yml

@@ -48,6 +48,7 @@ body:
       label: Version
       description: What is the version of CloudNativePG you are running?
       options:
+        - "1.26.0-rc2"            
         - "1.26.0-rc1"      
         - "1.25 (latest patch)"
         - "1.24 (latest patch)"