chore(RELEASE.md): Change volunteer (#5154)

Signed-off-by: Solomon Jacobs <solomonjacobs@protonmail.com>

Author: SoloJacobs

RELEASE.md

@@ -13,7 +13,7 @@ Release cadence of first pre-releases being cut is 12 weeks.
 | v0.29          | 2025-11-01            | Joe Adams (Github: @sysadmind)            |
 | v0.30          | 2025-12-12            | Solomon Jacobs (Github: @SoloJacobs)      |
 | v0.31          | 2026-01-31            | Solomon Jacobs (Github: @SoloJacobs)      |
-| v0.32          | 2026-04-06            | Anand Rajagopal (Github: @rajagopalanand) |
+| v0.32          | 2026-04-06            | Solomon Jacobs (Github: @SoloJacobs)      |
 | v0.33          | 2026-06-06            | **volunteer welcome**                     |
 
 If you are interested in volunteering please create a pull request against the [prometheus/alertmanager](https://github.com/prometheus/alertmanager) repository and propose yourself for the release of your choice.