Bump org.assertj:assertj-core from 3.25.3 to 3.26.0 in /devtools/gradle #41215

Job	Run time
Attach pull request number	3s
Initial JDK 17 Build	11m 21s
CI Sanity Check	31s
Calculate Test Jobs	13s
Gradle Tests - JDK 17	1m 13s
JVM Tests - JDK 17	7m 32s
Gradle Tests - JDK 17 Windows	3m 30s
Maven Tests - JDK ${{ matrix.java.name }}	0s
JVM Tests - JDK 21	6m 59s
Kubernetes Tests - JDK ${{ matrix.java.name }}	0s
JVM Tests - JDK 17 Windows	10m 57s
Quickstarts Compilation - JDK 17	5m 55s
Devtools Tests - JDK ${{ matrix.java.name }}	0s
Native Tests - Misc4	1m 15s
MicroProfile TCKs Tests	0s
Native Tests - Virtual Thread - ${{ matrix.category }}	0s
Build report	28s
	49m 57s

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