Update rust toolchain and remove cargo xbuild

Author: ALSchwalm

.github/workflows/rust.yml

@@ -6,7 +6,7 @@ jobs:
   fmt:
     runs-on: ubuntu-18.04
     container:
-      image: adamschwalm/hypervisor-build:9
+      image: adamschwalm/hypervisor-build:10
       options: "-u 0:0"
     steps:
     - uses: actions/checkout@v1
@@ -17,7 +17,7 @@ jobs:
     runs-on: ubuntu-18.04
     needs: fmt
     container:
-      image: adamschwalm/hypervisor-build:9
+      image: adamschwalm/hypervisor-build:10
       options: "-u 0:0"
     steps:
     - uses: actions/checkout@v1
@@ -28,7 +28,7 @@ jobs:
     runs-on: ubuntu-18.04
     needs: fmt
     container:
-      image: adamschwalm/hypervisor-build:9
+      image: adamschwalm/hypervisor-build:10
       options: "-u 0:0"
     steps:
     - uses: actions/checkout@v1