RFR: 8256354: Github Action build on Windows should define OS and MSVC versions

[Robin Westberg]

We should be more explicit about OS and compiler versions used in the GitHub Actions builds, to avoid problems caused by unexpected changes to the defaults. This patch changes the OS and MSVC versions used from latest (currently 2019) / default (currently 14.28) to 2019 / 14.27.

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Commit messages:
 - Use Windows 2019 and MSVC 14.27

Changes: https://git.openjdk.java.net/jdk/pull/1207/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=1207&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8256354
  Stats: 9 lines in 1 file changed: 7 ins; 0 del; 2 mod
  Patch: https://git.openjdk.java.net/jdk/pull/1207.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/1207/head:pull/1207

PR: https://git.openjdk.java.net/jdk/pull/1207