[OOB] Upgrades 'java' to '6.28.0'

[SvcGitHubPATagentoperatorimages]

Automated OOB update requested by SvcGitHubPATagentoperatorimages.

Agent: java
Version: 6.27.0 -> 6.28.0

[github-actions]

Images built:

dotnet-core: ghcr.io/contrast-security-oss/agent-operator-images/agent-dotnet-core@sha256:98522685ce87d1992e6498965a1fd8a63d415813de218db54feceaee4575264d
dotnet-framework: ghcr.io/contrast-security-oss/agent-operator-images/agent-dotnet-framework@sha256:a31f1a59ebbddd0231f9aeda5a4fcc312858d808cb3c06bc5e52d7301efbc14c
java: ghcr.io/contrast-security-oss/agent-operator-images/agent-java@sha256:1f248b15102a56bc5248f89e9f58ac5af57b5b18d2fe9cc50563876ef3fa41bd
nodejs: ghcr.io/contrast-security-oss/agent-operator-images/agent-nodejs@sha256:fabb55219dd9df171f56da32ae2b82caa456cfb9faac20c6c095f254d0ad29c5
php: ghcr.io/contrast-security-oss/agent-operator-images/agent-php@sha256:24aff1c98b7bd61c980ca71d6d56a039aa38ff859655314a07bf814acbb51689
python: ghcr.io/contrast-security-oss/agent-operator-images/agent-python@sha256:d948791cd0247916167695eeecf3b97285dc54bf1d19bdbf053555bb007a0160
flex: ghcr.io/contrast-security-oss/agent-operator-images/agent-flex@sha256:3365854538a8ae77e7a35474233ed80c79c8b454d7879653d56a41ca4b4a8e01