sec-release: updated 2024 q2 release (envoyproxy#34551)

Signed-off-by: Boteng Yao <boteng@google.com>

RELEASES.md

@@ -65,6 +65,7 @@ actual mechanics of the release itself.
 | 2022 Q4 | Can Cecen ([cancecen](https://github.com/cancecen))            | Tony Allen ([tonya11en](https://github.com/tonya11en))                   |
 | 2023 Q3 | Boteng Yao ([botengyao](https://github.com/botengyao))         | Kateryna Nezdolii ([nezdolik](https://github.com/nezdolik))              |
 | 2023 Q4 | Paul Merrison ([pmerrison](https://github.com/pmerrison))      | Brian Sonnenberg ([briansonnenberg](https://github.com/briansonnenberg)) |
+| 2024 Q2 | Ryan Northey ([phlax](https://github.com/phlax))               | Boteng Yao ([botengyao](https://github.com/botengyao))                   |
 
 ## Major release schedule
 
@@ -135,6 +136,7 @@ Security releases are published on a 3-monthly cycle, around the mid point betwe
 
 | Quarter |  Expected  |   Actual   | Difference |
 |:-------:|:----------:|:----------:|:----------:|
-| 2024 Q2 | 2024/06/04 |            |            |
+| 2024 Q2 | 2024/06/04 | 2024/06/04 |   0 days   |
+| 2024 Q3 | 2024/09/03 |
 
 NOTE: Zero-day vulnerabilities, and upstream vulnerabilities disclosed to us under embargo, may necessitate an emergency release with little or no warning.