RFR: 8269601: Increase gcc-10 version for github workflow

Tue Jun 29 16:15:07 UTC 2021

On Tue, 29 Jun 2021 14:52:28 GMT, Johan Vos <jvos at openjdk.org> wrote:

> install latest version of gcc/g++ (older specific versions are not available anymore)

Looks good, thanks for taking care of this. I note that [JDK-8266224](https://bugs.openjdk.java.net/browse/JDK-8266224) was already filed for this. I just assigned it to you. Perhaps you could change the title of this PR to use that bug ID instead? (and close the one you just filed as a duplicate).

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PR: https://git.openjdk.java.net/jfx/pull/555