Update pinned rustc version

Keats · Keats · commit 52a950cdf6fd · 2022-07-10T16:39:04.000+02:00
diff --git a/azure-pipelines.yml b/azure-pipelines.yml
@@ -21,7 +21,7 @@ stages:
               rustup_toolchain: stable
             linux-pinned:
               imageName: 'ubuntu-20.04'
-              rustup_toolchain: 1.56.0
+              rustup_toolchain: 1.57.0
         pool:
           vmImage: $(imageName)
         steps:
