Add misc programs to list of approved open source bug bounty programs

[mrthankyou]

The following open source projects:

https://github.com/stellar/stellar-core
https://github.com/stellar/horizon
https://github.com/stellar/bridge-server
https://github.com/stellar/java-stellar-sdk
https://github.com/stellar/js-stellar-sdk

And for reference the bug bounty program:

https://www.stellar.org/ecosystem/bug-bounty-program?locale=en#scope

[mrthankyou]

ByteDance has a list of OSS in their Github org. I don't see any mention of the OSS being out-of-scope in their program details. I assume in cases like that it would be worth it to add to the list?

https://github.com/bytedance
https://hackerone.com/tiktok?type=team