chore(issue-template): add version 1.26.0

Author: Meierschlumpf

.github/ISSUE_TEMPLATE/bug_report.yml

@@ -31,6 +31,7 @@ body:
       label: Version
       description: What version of Homarr are you running?
       options:
+        - 1.26.0
         - 1.25.0
         - 1.24.0
         - 1.23.0