modify reference of master branch to main

[christopher-maboh]

🎫 Ticket

https://jira.cms.gov/browse/PLT-326

🛠 Changes

Reference to master branch was changed to main

ℹ️ Context for reviewers

Github repository master branch renamed to main. changes made to reference main in jenkins instead of master

✅ Acceptance Validation

(How were the changes verified? Did you fully test the acceptance criteria in the ticket? Provide reproducible testing instructions and screenshots if applicable.)

🔒 Security Implications

• This PR adds a new software dependency or dependencies.
• This PR modifies or invalidates one or more of our security controls.
• This PR stores or transmits data that was not stored or transmitted before.
• This PR requires additional review of its security implications for other reasons.

If any security implications apply, add Jason Ashbaugh (GitHub username: StewGoin) as a reviewer and do not merge this PR without his approval.

[gsf]

Looks good but missed this one:

bcda-ssas-app/db/migrations/README.md

Line 7 in d15f06c

* Engineers should keep aware of identifier collisions (and in some instances required migration order), and adjust their migration ID’s before merging with master, if necessary.