Upgrading versions not linked to dependencies

[JordanLongstaff]

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I have a Gradle version catalog that has these two version variables declared:

pitest = "1.20.0"
pitest-junit5 = "1.2.2"

These versions aren't used for dependency declarations; instead, they're used for plugin properties in my build scripts, like so:

pitest {
    pitestVersion = libs.versions.pitest.asProvider()
    junit5PluginVersion = libs.versions.pitest.junit5
    ...
}

Can Renovate be configured to update these variables automatically?

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[Churro]

Yes, this is possible via custom managers, see https://docs.renovatebot.com/modules/manager/regex/#configuration-templates

In your case, you need two entries with matchStrings pointing to the version variables, depNameTemplate referencing the full Maven artifact, e.g., org.pitest:pitest-maven and datasourceTemplate set to maven.