chore: update RELEASE_POLICY with v1.16.1

Bump the v1.16 'Latest Patch' entry to v1.16.1 for the patch release.

Signed-off-by: Jay Chung <jaehoc@amazon.com>

Author: not4s

docs/RELEASE_POLICY.md

@@ -90,7 +90,7 @@ v3.1 will be patched since were the last two Firecracker releases and less than
 
 | Release | Release Date | Latest Patch | Min. end of support | Official end of Support         |
 | ------: | -----------: | -----------: | ------------------: | :------------------------------ |
-|   v1.16 |   2026-06-03 |      v1.16.0 |          2026-12-03 | Supported                       |
+|   v1.16 |   2026-06-03 |      v1.16.1 |          2026-12-03 | Supported                       |
 |   v1.15 |   2026-03-09 |      v1.15.1 |          2026-09-09 | Supported                       |
 |   v1.14 |   2025-12-17 |      v1.14.4 |          2026-06-17 | 2026-06-03 (v1.16 released)     |
 |   v1.13 |   2025-08-28 |      v1.13.2 |          2026-02-28 | 2026-03-09 (v1.15 released)     |