Update self-hosted changelog: v0.115.6 (#5645)

Co-authored-by: thesandlord <8902396+thesandlord@users.noreply.github.com>

Author: fern-support

fern/products/docs/pages/self-hosted/changelog/2026-05-29.mdx

@@ -0,0 +1,7 @@
+### v0.115.6
+
+```dockerfile
+FROM fernenterprise/fern-self-hosted:0.115.6
+```
+
+Digest: `sha256:654a4980a1faa6bd9ba1b56e61fdda229290d56ce296746e5297eb0f1ab5bfa3`