Java 21

[alexduf]

Move the project to java 21

I've had to do a few things following the move to java 21:

• There was one use of reflection which I wasn't sure was still going to work. But we didn't need to use reflection anymore so I've just removed it
• There were two deprecated calls to fetch how much RAM is being used by the JVM, I've replaced them
• Java 21 deprecates the construction of java.net.URL. We were only using java.net.URL for parsing, so it was just a matter of replacing by java.net.URI, which has almost the same behaviour. I've noticed that one of our unit test failed with a null pointer exception, and I think potentially java.net.URI can return null in places that didn't return null on java.net.URL, so we'll keep an eye on the logs after releasing this
• Finally, Mockito (which is using some pretty deep JVM stuff) needed to be upgraded too, which meant changing quite a few imports and some slight tweaks to our tests.

[github-actions]

Deploy build 6424 of dotcom:frontend-all to CODE

All deployment options

• Deploy build 6424 of dotcom:frontend-all to CODE
• Deploy parts of build 6424 to CODE by previewing it first
• What's on CODE right now?

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From guardian/actions-riff-raff.

[alexduf]

smoke tested in CODE ✅

[arelra]

📈 🎉