Update dev.patrickgold.florisboard.yml (0.4 release)

Required

• The app complies with the inclusion criteria
• All related fdroiddata and RFP issues have been referenced in this merge request
• Builds with fdroid build

Strongly Recommended

• The upstream app source code repo contains the app metadata (summary/description/images/changelog/etc) in a Fastlane or Triple-T folder structure
• Releases are tagged

Suggested

• External repos are added as git submodules instead of srclibs
• Multiple apks for native code

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This PR updates the build config for the 0.4 release of FlorisBoard. In particular FlorisBoard does not use ICU4C anymore directly, as such any references and scandeletes to this have been removed. Java has been updated to JDK 17. Also Rust is now required, which is installed with the update command.