Remove matrix for Deno template. (#1024)

Fixes: The actions/checkout action on windows checks out files with \r\n line endings instead of preserving them. This causes deno fmt --check to fail because the line endings are \r\n instead of \n. Instead of working around this problem specifically on Windows, this change removes the matrix in order to simplify the action.

Co-authored-by: Josh Gross <joshmgross@github.com>

ci/deno.yml

@@ -3,7 +3,7 @@
 # separate terms of service, privacy policy, and support
 # documentation.
 
-# This workflow will install Deno and run tests across stable and canary builds on Windows, Ubuntu and macOS.
+# This workflow will install Deno then run Deno lint and test.
 # For more information see: https://github.com/denoland/setup-deno
 
 name: Deno
@@ -16,12 +16,7 @@ on:
 
 jobs:
   test:
-    runs-on: ${{ matrix.os }} # runs a test on Ubuntu, Windows and macOS
-
-    strategy:
-      matrix:
-        deno: ["v1.x", "canary"]
-        os: [macOS-latest, windows-latest, ubuntu-latest]
+    runs-on: ubuntu-latest
 
     steps:
       - name: Setup repo
@@ -29,9 +24,9 @@ jobs:
 
       - name: Setup Deno
         # uses: denoland/setup-deno@v1
-        uses: denoland/setup-deno@4a4e59637fa62bd6c086a216c7e4c5b457ea9e79
+        uses: denoland/setup-deno@004814556e37c54a2f6e31384c9e18e9833173669
         with:
-          deno-version: ${{ matrix.deno }} # tests across multiple Deno versions
+          deno-version: v1.x
 
       # Uncomment this step to verify the use of 'deno fmt' on each commit.
       # - name: Verify formatting
@@ -40,8 +35,5 @@ jobs:
       - name: Run linter
         run: deno lint
 
-      - name: Cache dependencies
-        run: deno cache deps.ts
-
       - name: Run tests
         run: deno test -A --unstable