Since IntelliJ 2019.3 this file appeared in our git changes. It seems these are just cached information about remote repositories that are defined in Maven/Gradle.pull/3221/head^2
# auto-import. | # auto-import. | ||||
# .idea/artifacts | # .idea/artifacts | ||||
# .idea/compiler.xml | # .idea/compiler.xml | ||||
# .idea/jarRepositories.xml | |||||
# .idea/modules.xml | # .idea/modules.xml | ||||
# .idea/*.iml | # .idea/*.iml | ||||
# .idea/modules | # .idea/modules |