chore: fix the stability doc (#6035)

docs/introduction/stability-support.md

@@ -18,6 +18,7 @@ As of version 0.14.x , this is the only kubernetes version that we will guarante
 
 | ESO Version | Kubernetes Version | Release Date | End of Life           |
 |-------------|--------------------|--------------|-----------------------|
+| 2.1         | 1.34-1.35          | Mar 06, 2026 | Release of next minor |
 | 2.0         | 1.34-1.35          | Feb 06, 2026 | Release of next minor |
 | 1.3         | 1.34               | Jan 23, 2026 | Feb 06, 2026          |
 | 1.2         | 1.34               | Dec 19, 2025 | Jan 23, 2026          |