Bump org.jetbrains.kotlin:kotlin-gradle-plugin-api from 2.0.0 to 2.0.20 in /devtools/gradle #561

Job	Run time
Initial JDK 17 Build	12m 57s
Attach pull request number	3s
CI Sanity Check	31s
Calculate Test Jobs	12s
Gradle Tests - JDK 17	29m 8s
JVM Tests - JDK 17	9m 33s
Gradle Tests - JDK 17 Windows	50m 25s
JVM Tests - JDK 21	6m 52s
JVM Tests - JDK 17 Windows	10m 28s
Devtools Tests - JDK ${{ matrix.java.name }}	0s
Maven Tests - JDK ${{ matrix.java.name }}	0s
Kubernetes Tests - JDK ${{ matrix.java.name }}	0s
Quickstarts Compilation - JDK 17	9m 57s
Native Tests - Misc4	17m 40s
Native Tests - Virtual Thread - ${{ matrix.category }}	0s
MicroProfile TCKs Tests	0s
Upload build stats to collector	0s
Build report	40s
	2h 28m 26s

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