chore: try git-bash on windows

Author: achingbrain

.travis.yml

@@ -28,10 +28,9 @@ before_install:
   # prevents windows error: npm ERR! ... git-sh-setup: file not found
   - if [[ "$TRAVIS_OS_NAME" == "windows" ]]; then export PATH=/c/PROGRA~1/Git/usr/bin:/c/PROGRA~1/Git/mingw64/libexec/git-core:$PATH ; fi
   # allow windows to run scripts with node 14 and npm 7 (may not be necessary when node 14 is no longer lts)
-  - if [[ "$TRAVIS_OS_NAME" == "windows" ]]; then npm config set script-shell powershell ; fi
-  - if [[ "$TRAVIS_OS_NAME" == "windows" ]]; then powershell Set-ExecutionPolicy -Scope CurrentUser Bypass ; fi
+  - if [[ "$TRAVIS_OS_NAME" == "windows" ]]; then npm config set script-shell c:/PROGRA~1/Git/git-bash.exe ; fi
   # workspaces require npm 7 or above
-  - if [[ "$TRAVIS_OS_NAME" == "windows" ]]; then powershell npm install -g npm@latest ; fi
+  - if [[ "$TRAVIS_OS_NAME" == "windows" ]]; then c:/PROGRA~1/Git/git-bash.exe npm install -g npm@latest ; fi
   - if [[ "$TRAVIS_OS_NAME" != "windows" ]]; then npm install -g npm@latest ; fi
 
 script: npx nyc -s npm run test -- -- -- -t node --bail