Update num-bigint

Author: sebastiencs

Cargo.lock

@@ -87,7 +87,7 @@ ark-ec = { git = "https://github.com/openmina/algebra", rev = "d0343f5" } # bran
 ark-poly = { git = "https://github.com/openmina/algebra", rev = "d0343f5" } # branch: fix-openmina-webnode
 ark-serialize = { git = "https://github.com/openmina/algebra", rev = "d0343f5" } # branch: fix-openmina-webnode
 
-num-bigint = { git = "https://github.com/openmina/num-bigint", rev = "028b29c" } # branch: on-stack
+num-bigint = { git = "https://github.com/openmina/num-bigint", rev = "8bb5ee4" } # branch: on-stack
 num-rational = { git = "https://github.com/openmina/num-rational", rev = "336f11d" } # branch: on-stack
 
 [profile.test.package."*"]