Add vulnerability exclusion

[johnwatson484]

Description

Please include a summary of the changes i.e. Node.js version updates, libraries patched, or issues added to the policy file.

Checklist:

• I have ensured the Defra version in the JOB.env file matches that in the Dockerfile
• I have ensured the Node.js versions in the image-matrix.json match the Dockerfile and the table in the README.md
• I have added newly ignored vulnerabilities to the POLICY_CONFIGURATION.md
• I have checked if previously identified vulnerabilities have been patched, and can be removed from the .grype.yaml, .trivyignore and POLICY_CONFIGURATION.md files

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud