v1.15- update supported release versions (#4639)

Signed-off-by: joshvanl <me@joshvanl.dev>

Author: JoshVanL

daprdocs/content/en/operations/support/support-release-policy.md

@@ -45,6 +45,8 @@ The table below shows the versions of Dapr releases that have been tested togeth
 
 | Release date | Runtime     | CLI  | SDKs  | Dashboard  | Status | Release notes |
 |--------------------|:--------:|:--------|---------|---------|---------|------------|
+| April 4th 2025 | 1.15.4</br>  | 1.15.0 | Java 1.14.0 </br>Go 1.12.0 </br>PHP 1.2.0 </br>Python 1.15.0 </br>.NET 1.15.4 </br>JS 3.5.2 </br>Rust 0.16.1 | 0.15.0 | Supported (current) | [v1.15.4 release notes](https://github.com/dapr/dapr/releases/tag/v1.15.4) |
+| March 5rd 2025 | 1.15.3</br>  | 1.15.0 | Java 1.14.0 </br>Go 1.12.0 </br>PHP 1.2.0 </br>Python 1.15.0 </br>.NET 1.15.4 </br>JS 3.5.2 </br>Rust 0.16.1 | 0.15.0 | Supported (current) | [v1.15.3 release notes](https://github.com/dapr/dapr/releases/tag/v1.15.3) |
 | March 3rd 2025 | 1.15.2</br>  | 1.15.0 | Java 1.14.0 </br>Go 1.12.0 </br>PHP 1.2.0 </br>Python 1.15.0 </br>.NET 1.15.0 </br>JS 3.5.0 </br>Rust 0.16 | 0.15.0 | Supported (current) | [v1.15.2 release notes](https://github.com/dapr/dapr/releases/tag/v1.15.2) |
 | February 28th 2025 | 1.15.1</br>  | 1.15.0 | Java 1.14.0 </br>Go 1.12.0 </br>PHP 1.2.0 </br>Python 1.15.0 </br>.NET 1.15.0 </br>JS 3.5.0 </br>Rust 0.16 | 0.15.0 | Supported (current) | [v1.15.1 release notes](https://github.com/dapr/dapr/releases/tag/v1.15.1) |
 | February 27th 2025 | 1.15.0</br>  | 1.15.0 | Java 1.14.0 </br>Go 1.12.0 </br>PHP 1.2.0 </br>Python 1.15.0 </br>.NET 1.15.0 </br>JS 3.5.0 </br>Rust 0.16 | 0.15.0 | Supported | [v1.15.0 release notes](https://github.com/dapr/dapr/releases/tag/v1.15.0) |