8256983: GitHub actions: specify the version of each platform OS and compiler #366
As described in the JBS issue, we should specify the specific version of each OS and compiler rather than just using the defaults. This will help insulate us from changes to the defaults that can break the build, and has recently done so.
On Linux, we upgraded to 20.04 (18.04 is still the default), which required specifying the version of ant, since the default version for 20.04 is 1.10.7 which has a bug that causes FX apps to fail. I decided to also specify the version of ant (1.10.5) for all three platforms.
The following will be used:
 The Microsoft compiler version is unspecified as there is a dependency on JDK-8255713 in addition to the problem of increasing the build time to download a specific version.
@kevinrushforth This change now passes all automated pre-integration checks.
After integration, the commit message for the final commit will be:
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Pushed as commit f2928d9.