Bump JavaFX for Linux Aarch64

[infeo]

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• I have searched existing issues for duplicates
• I agree to follow this project's Code of Conduct

Summary

Update the appImage & debian workflows once there exists an openjfx aarch64 jmod.

Motivation

Cryptomator uses for build the OpenJFX jmods provided by Gluon. In the past time, one could download the jmods from their website for all platforms. Since half a year, the linux aarch64 jmod is not shown anymore, although it could be downloaded.

This has now changed. Using https://download2.gluonhq.com/openjfx/21.0.2/openjfx-21.0.2_linux-aarch64_bin-jmods.zip leads to an "Access Denied" message. Hence, all linux aarch64 builds need to stay on JavaFX 21.0.1 for now.

Considered Alternatives

• Build jmods ourselfves: that would be a whole lotta work.
• find another jmod provider

Anything else?

I'll ask on the openjfx mailing list, since messages to support@gluonhq.com were not answered.

[infeo]

See https://mail.openjdk.org/pipermail/openjfx-dev/2024-January/045043.html

[infeo]

Due to the upcoming release and that we do not want to split our maven-dependencies (see https://github.com/cryptomator/cryptomator/actions/runs/7712193673/job/21019199932#step:7:105), i reverted the general jfx update in 85c52c6