Update bsc docker image

Signed-off-by: Takeshi Arabiki <takeshi.arabiki@datachain.jp>

Author: abicky

e2e/chains/bsc/docker-compose.bsc.yml

@@ -5,5 +5,5 @@ services:
       dockerfile: Dockerfile.bsc
       args:
         GIT_SOURCE: https://github.com/bnb-chain/bsc
-        GIT_CHECKOUT_BRANCH: v1.5.10
+        GIT_CHECKOUT_BRANCH: v1.5.12
     image: bsc-geth:docker-local