Update Flex Agent and allow for OOB Action updates

[hmcginnis]

📌 update Flex Agent to latest version
✨ add Flex Agent to oob update script

https://github.com/Contrast-Security-OSS/agent-operator-images/actions/runs/16811242433/job/47616845430

[github-actions]

Images built:

dotnet-core: ghcr.io/contrast-security-oss/agent-operator-images/agent-dotnet-core@sha256:99d46fb1c01139ef30e8acb7aab884c4f2d058aee08ed97679d59e0ba8d4b088
dotnet-framework: ghcr.io/contrast-security-oss/agent-operator-images/agent-dotnet-framework@sha256:d81bac6ed8ee1a8a418ec0051156e6398958da2f0027d0aaa70f6059568c1474
java: ghcr.io/contrast-security-oss/agent-operator-images/agent-java@sha256:46109d1e9c656813fcc9c3ede1798263b849e417fbf93d44ef5c03861a9630a8
nodejs: ghcr.io/contrast-security-oss/agent-operator-images/agent-nodejs@sha256:3bc2e3ea85c4002a60bd4411aee955627db5794a13a1223097d6df62d3302259
php: ghcr.io/contrast-security-oss/agent-operator-images/agent-php@sha256:6120d9c8a86171484a21d94ef446af3d017b610715e1516b566a52af8469fd65
python: ghcr.io/contrast-security-oss/agent-operator-images/agent-python@sha256:291f61b09421b9de37d45d7a93ec222940062a7e8b8bd048ebd2eab2b5fa863e
flex: ghcr.io/contrast-security-oss/agent-operator-images/agent-flex@sha256:40aa02400832d3bc0a73a0c2455f2b57dff5b47bcb3bc96224a0960ce7543a74