Update plugin com.diffplug.spotless to v8.7.0

[renovate]

This PR contains the following updates:

Package	Change	Age	Confidence
com.diffplug.spotless	8.5.1 → 8.7.0

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[renovate]

⚠️ Artifact update problem

Renovate failed to update an artifact related to this branch. You probably do not want to merge this PR as-is.

♻ Renovate will retry this branch, including artifacts, only when one of the following happens:

• any of the package files in this branch needs updating, or
• the branch becomes conflicted, or
• you click the rebase/retry checkbox if found above, or
• you rename this PR's title to start with "rebase!" to trigger it manually

The artifact failure details are included below:

File name: library/build.gradle

Command failed: ./gradlew -Dorg.gradle.jvmargs=-Xms512m -Xmx512m --console=plain --dependency-verification lenient -q --write-verification-metadata sha256,pgp dependencies
Exception in thread "main" java.io.IOException: Downloading from https://services.gradle.org/distributions/gradle-9.5.1-all.zip failed: timeout (10000ms)
	at org.gradle.wrapper.Download.download(SourceFile:1)
	at org.gradle.wrapper.Install.forceFetch(SourceFile)
	at org.gradle.wrapper.Install.lambda$createDist$0(SourceFile:9)
	at org.gradle.wrapper.Install.createDist(SourceFile:24)
	at org.gradle.wrapper.GradleWrapperMain.lambda$prepareWrapper$0(SourceFile:2)
	at org.gradle.wrapper.GradleWrapperMain.main(SourceFile:2)
Caused by: java.net.SocketTimeoutException: Read timed out
	at java.base/sun.nio.ch.NioSocketImpl.timedRead(NioSocketImpl.java:277)
	at java.base/sun.nio.ch.NioSocketImpl.implRead(NioSocketImpl.java:302)
	at java.base/sun.nio.ch.NioSocketImpl.read(NioSocketImpl.java:354)
	at java.base/sun.nio.ch.NioSocketImpl$1.read(NioSocketImpl.java:798)
	at java.base/java.net.Socket$SocketInputStream.implRead(Socket.java:974)
	at java.base/java.net.Socket$SocketInputStream.read(Socket.java:964)
	at java.base/sun.security.ssl.SSLSocketInputRecord.read(SSLSocketInputRecord.java:489)
	at java.base/sun.security.ssl.SSLSocketInputRecord.readFully(SSLSocketInputRecord.java:472)
	at java.base/sun.security.ssl.SSLSocketInputRecord.decodeInputRecord(SSLSocketInputRecord.java:243)
	at java.base/sun.security.ssl.SSLSocketInputRecord.decode(SSLSocketInputRecord.java:181)
	at java.base/sun.security.ssl.SSLTransport.decode(SSLTransport.java:111)
	at java.base/sun.security.ssl.SSLSocketImpl.decode(SSLSocketImpl.java:1509)
	at java.base/sun.security.ssl.SSLSocketImpl.readApplicationRecord(SSLSocketImpl.java:1480)
	at java.base/sun.security.ssl.SSLSocketImpl$AppInputStream.read(SSLSocketImpl.java:1068)
	at java.base/java.io.BufferedInputStream.read1(BufferedInputStream.java:328)
	at java.base/java.io.BufferedInputStream.read(BufferedInputStream.java:388)
	at java.base/sun.net.www.MeteredStream.read(MeteredStream.java:134)
	at java.base/java.io.FilterInputStream.read(FilterInputStream.java:119)
	at java.base/sun.net.www.protocol.http.HttpURLConnection$HttpInputStream.read(HttpURLConnection.java:3308)
	at java.base/sun.net.www.protocol.http.HttpURLConnection$HttpInputStream.read(HttpURLConnection.java:3301)
	... 6 more