RFR: 8260245: Update ICU4C to version 68.2

Wed Apr 7 13:50:15 UTC 2021

On Mon, 5 Apr 2021 18:14:36 GMT, Arun Joseph <ajoseph at openjdk.org> wrote:

> We currently use ICU4C version 64.2. We should update to the latest stable version 68.2.
> http://site.icu-project.org/home

build.gradle line 1914:

> 1912:                 }
> 1913:                 patternLayout {
> 1914:                     artifact "download/release-68-2/[artifact].[ext]"

shouldn't 68-2 be a property?

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PR: https://git.openjdk.java.net/jfx/pull/456