BI-1965 - Upgrade Gigwa to v2.6.2

[timparsons]

Description

Story: https://breedinginsight.atlassian.net/browse/BI-1965

• Fixed HTTP header from X-FORWARDED-SERVER (used in previous Gigwa version) to X-FORWARDED-FOR (v2.6.2)
• bumped mongo version

Dependencies

gigwa-pom/feature/BI-1965

Testing

• Build the gigwa docker image locally, then run the GigwaGenotypeServiceImplIntegrationTest and ensure it passes
• Run DeltaBreed, and ensure you can upload a VCF file successfully

Checklist:

• I have performed a self-review of my own code
• I have tested my code and ensured it meets the acceptance criteria of the story
• I have tested that my code works with both the brapi-java-server and BreedBase
• I have create/modified unit tests to cover this change
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to documentation
• I have run TAF: <please include a link to TAF run>