[cd] Bump CIRCT from firtool-1.77.0 to firtool-1.78.1 (#222)

This is an automated commit generated by the `circt/update-circt` GitHub
Action.

Co-authored-by: chiselbot <chiselbot@users.noreply.github.com>

include/circt.json

@@ -1,3 +1,3 @@
 {
-  "version": "firtool-1.77.0"
+  "version": "firtool-1.78.1"
 }