fix: nightly testing eks config architecture (#452)

## Description
Fix the architecture in the config used for the nightly testing bundle.

## Related Issue

![Screenshot from 2024-06-03
08-01-54](https://github.com/defenseunicorns/uds-core/assets/40547442/0bc56f1f-157f-4240-8f85-db93804cd85c)


## Type of change

- [x] Bug fix (non-breaking change which fixes an issue)
- [ ] New feature (non-breaking change which adds functionality)
- [ ] Other (security config, docs update, etc)

## Checklist before merging

- [ ] Test, docs, adr added or updated as needed
- [ ] [Contributor Guide
Steps](https://github.com/defenseunicorns/uds-template-capability/blob/main/CONTRIBUTING.md)(https://github.com/defenseunicorns/uds-template-capability/blob/main/CONTRIBUTING.md#submitting-a-pull-request)
followed

Author: TristanHoladay

tasks/iac.yaml

@@ -134,7 +134,7 @@ tasks:
       - cmd: |
           cat <<EOF> .github/bundles/uds-config.yaml
           options:
-          architecture: amd6
+            architecture: amd64
           variables:
             core:
               loki_chunks_bucket: ${LOKI_S3_BUCKET}