docs: update release cadence doc w/ future releases (#19065)

Signed-off-by: Michael Crenshaw <350466+crenshaw-dev@users.noreply.github.com>

docs/developer-guide/release-process-and-cadence.md

@@ -14,7 +14,10 @@ These are the upcoming releases dates:
 | v2.9    | Monday, Sep. 18, 2023 | Monday, Nov. 6, 2023 | [Leonardo Almeida](https://github.com/leoluz)         | [Leonardo Almeida](https://github.com/leoluz)         | [checklist](https://github.com/argoproj/argo-cd/issues/14078) |
 | v2.10   | Monday, Dec. 18, 2023 | Monday, Feb. 5, 2024 | [Katie Lamkin](https://github.com/kmlamkin9)          |                                                       | [checklist](https://github.com/argoproj/argo-cd/issues/16339) |
 | v2.11   | Friday, Apr. 5,  2024 | Monday, May 6, 2024  | [Pavel Kostohrys](https://github.com/pasha-codefresh) | [Pavel Kostohrys](https://github.com/pasha-codefresh) | [checklist](https://github.com/argoproj/argo-cd/issues/17726) |
-| v2.12   | Monday, Jun. 17, 2024 | Monday, Aug. 5, 2024 | 
+| v2.12   | Monday, Jun. 17, 2024 | Monday, Aug. 5, 2024 | [Ishita Sequeira](https://github.com/ishitasequeira) | [Pavel Kostohrys](https://github.com/pasha-codefresh) | [checklist](https://github.com/argoproj/argo-cd/issues/19063) |
+| v2.13   | Monday, Sep. 16, 2024 | Monday, Nov. 4, 2024 | | | |
+| v2.14   | Monday, Dec. 16, 2024 | Monday, Feb. 3, 2025 | | | |
+| v2.15   | Monday, Mar. 17, 2025 | Monday, May 5, 2025 | | | |
 
 Actual release dates might differ from the plan by a few days.