Update PureScript in CI and add psa to devDependencies

Author: thomashoneyman

.github/workflows/ci.yml

@@ -10,21 +10,21 @@ jobs:
 
       - uses: purescript-contrib/setup-purescript@main
         with:
-          purescript: "0.13.8"
+          purescript: "0.14.2"
 
       - uses: actions/setup-node@v1
         with:
           node-version: "12"
 
       - name: Install dependencies
         run: |
-          npm install -g bower
           npm install
-          bower install --production
+          npx bower install --production
+
       - name: Build source
         run: npm run-script build
 
       - name: Run tests
         run: |
-          bower install
+          npx bower install
           npm run-script test --if-present