added photo credit

pages/blog/beyond-boundaries.md

@@ -77,3 +77,5 @@ By sponsoring us, we would be able to use your sponsorship funds to provide more
 
 - Join [our Slack workspace](https://www.asyncapi.com/slack-invite). Just make sure to follow our [Slack etiquette](https://github.com/asyncapi/.github/blob/master/slack-etiquette.md) and [the code of conduct](https://github.com/asyncapi/.github/blob/master/CODE_OF_CONDUCT.md).
 - Join the dedicated Mentorship channel `#mentorships` that we use for all mentorships discussion. All mentees and mentors are there.
+
+> Photo by <a href="https://unsplash.com/@noguidebook?utm_source=unsplash&utm_medium=referral&utm_content=creditCopyText">Rachel</a> on <a href="https://unsplash.com/photos/U4zpPfvogJ4?utm_source=unsplash&utm_medium=referral&utm_content=creditCopyText">Unsplash</a>