Spotless config is using heavily discouraged wildcards

[ColtonIdle]

diffplug/spotless#111 (comment)

Maintainer of spotless says

Just a bump that src/*/java/**/*.java will perform far better than **/*.java. We heavily discourage **/blah wildcards.

Meanwhile NIA uses the heavily discouraged wildcards

such as

            kotlin {
                target("**/*.kt")
                targetExclude("**/build/**/*.kt")
                ktlint(ktlintVersion).editorConfigOverride(
                    mapOf(
                        "android" to "true",
                    ),
                )
                licenseHeaderFile(rootProject.file("spotless/copyright.kt"))
            }