fix readme

Signed-off-by: Adrian Cole <[email protected]>

README.md

@@ -16,9 +16,9 @@ This is an internal base layer primarily used in [zipkin](https://github.com/ope
 To try the image, run the `java -version` command:
 ```bash
 $ docker run --rm ghcr.io/openzipkin/java:21.0.3_p9 -version
-openjdk version "21.0.2" 2024-01-16
-OpenJDK Runtime Environment (build 21.0.2+13-alpine-r2)
-OpenJDK 64-Bit Server VM (build 21.0.2+13-alpine-r2, mixed mode, sharing)
+openjdk version "21.0.3" 2024-04-16
+OpenJDK Runtime Environment (build 21.0.3+9-alpine-r0)
+OpenJDK 64-Bit Server VM (build 21.0.3+9-alpine-r0, mixed mode, sharing)
 ```
 
 ## Release process
@@ -46,9 +46,9 @@ revision classifier from here:
 Next, verify the built image matches that version:
 ```bash
 $ docker run --rm openzipkin/java:test -version
-openjdk version "21.0.2" 2024-01-16
-OpenJDK Runtime Environment (build 21.0.2+13-alpine-r2)
-OpenJDK 64-Bit Server VM (build 21.0.2+13-alpine-r2, mixed mode, sharing)
+openjdk version "21.0.3" 2024-04-16
+OpenJDK Runtime Environment (build 21.0.3+9-alpine-r0)
+OpenJDK 64-Bit Server VM (build 21.0.3+9-alpine-r0, mixed mode, sharing)
 ```
 
 To release the image, push a tag matching the arg to `build-bin/build` (ex `21.0.3_p9`).