message: ci: Upgrade build images, Clang to version 11
diff: @@ -6,15 +6,12 @@ parameters:
  default: false
  executors:
  - linux-gcc-9:
  - docker:
  - - image: ethereum/cpp-build-env:15-gcc-9
  linux-gcc-latest:
  docker:
  - - image: ethereum/cpp-build-env:15-gcc-10
  + - image: ethereum/cpp-build-env:16-gcc-10
  linux-clang-latest:
  docker:
  - - image: ethereum/cpp-build-env:15-clang-10
  + - image: ethereum/cpp-build-env:16-clang-11
  macos:
  macos:
  xcode: 11.6.0
  @@ -294,7 +291,7 @@ jobs:
  - test
  release-linux:
  - executor: linux-gcc-9
  + executor: linux-gcc-latest
  steps:
  - install_testfloat
  - checkout
  