Fix typo in SECURITY-INSIGHTS.yml (#4922)

## Which problem is this PR solving?
Fixing a typo in the yaml

## Description of the changes
Added a tab

## How was this change tested?
Not needed

## Checklist
- [X] I have read
https://github.com/jaegertracing/jaeger/blob/master/CONTRIBUTING_GUIDELINES.md
- [X] I have signed all commits
- [Not needed] I have added unit tests for the new functionality
- [Not needed] I have run lint and test steps successfully

Signed-off-by: Jonah Kowall <[email protected]>

SECURITY-INSIGHTS.yml

@@ -29,7 +29,7 @@ security-artifacts:
     threat-model-created: true
     evidence-url:
     - https://github.com/jaegertracing/jaeger/blob/main/THREAT-MODEL.md
-self-assessment:
+  self-assessment:
     self-assessment-created: true
     evidence-url:
     - https://github.com/jaegertracing/jaeger/blob/main/SELF-ASSESMENT.md