Try reordering test-all and test-spec for mswin CI

Visual Studio 2019 GitHub Actions has been super unstable. Somehow nmake
test-spec triggers rebuilding the interpreter and fails.

usa suggested a possibility of test-all leaving something impacting
test-spec. I'd like to try this patch and see what happens.

.github/workflows/windows.yml

@@ -128,14 +128,12 @@ jobs:
           YACC: win_bison
       - run: nmake test
         timeout-minutes: 5
+      - run: nmake test-spec
+        timeout-minutes: 10
       - run: nmake test-all
         env:
           RUBY_TESTOPTS: -j${{env.TEST_JOBS}} --job-status=normal
         timeout-minutes: 60
-        continue-on-error: ${{ matrix.continue-on-error || false }}
-      - run: nmake test-spec
-        timeout-minutes: 10
-        continue-on-error: ${{ matrix.continue-on-error || false }}
       - uses: k0kubun/action-slack@v2.0.0
         with:
           payload: |