Add coursier to devshell #138

Job	Run time
Build scip-java CLI	4m 20s
maven-kotlin-json-kotlin-maven	1m 57s
gradle-java21-readiness	2m 54s
gradle-kotlin-flowext	4m 6s
bazel-java-examples	3m 26s
maven-java25-demo	2m 17s
gradle-mixed-okio-jmh	4m 25s
gradle-kotlin-okio	4m 0s
maven-java17-spring-boot	2m 26s
	29m 51s

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