Revert "Workaround for jruby/jruby#7182"

* This reverts commit b2027b6.
* No longer needed (actions/runner-images@2900984).

Author: eregon

.github/workflows/build.yml

@@ -127,8 +127,6 @@ jobs:
         include:
         - { os: windows-2019, jruby-version: 9.2.21.0, ruby: jruby-9.2.21.0 }
     runs-on: ${{ matrix.os }}
-    env: # https://github.com/jruby/jruby/issues/7182
-      JAVA_OPTS: -Djdk.io.File.enableADS=true
     steps:
     - uses: actions/checkout@v2
     - name: Set tag name