Revert "Pin bots to dev-40.0 (#1642)" (#1645)

This reverts commit b9087d6.

Author: jcollins-g

.travis.yml

@@ -1,7 +1,7 @@
 language: dart
 sudo: false
 dart:
-  - "dev/raw/2.0.0-dev.40.0"
+  - "dev/raw/latest"
 env:
   - DARTDOC_BOT=main
   # TODO(devoncarew): add angulardart support

appveyor.yml

@@ -3,7 +3,7 @@
 # BSD-style license that can be found in the LICENSE file.
 
 install:
-  - ps: wget https://storage.googleapis.com/dart-archive/channels/dev/raw/2.0.0-dev.40.0/sdk/dartsdk-windows-x64-release.zip -OutFile dart-sdk.zip
+  - ps: wget https://storage.googleapis.com/dart-archive/channels/dev/raw/latest/sdk/dartsdk-windows-x64-release.zip -OutFile dart-sdk.zip
   - cmd: echo "Unzipping dart-sdk..."
   - cmd: 7z x dart-sdk.zip -o"C:\tools" -y > nul
   - set PATH=%PATH%;C:\tools\dart-sdk\bin