build: use rust 1.56.0

DrPeterVanNostrand · DrPeterVanNostrand · commit 2fd142d2a882 · 2022-03-10T18:41:22.000Z
diff --git a/.circleci/config.yml b/.circleci/config.yml
@@ -3,7 +3,7 @@ version: 2.1
 parameters:
   nightly-toolchain:
     type: string
-    default: "nightly-2021-04-24"
+    default: "nightly-2022-03-09"
 
 executors:
   default:
diff --git a/rust-toolchain b/rust-toolchain
@@ -1 +1 @@
-1.54.0
+1.56.0
