Update guava and checkstyle (#4066)
Update guava and checkstyle (#4066)

guava 25.0 -> 25.1
checkstyle 8.10 -> 8.10.1
Siedlerchr/jabref,Siedlerchr/jabref,tobiasdiez/jabref,Siedlerchr/jabref,tobiasdiez/jabref,JabRef/jabref,sauliusg/jabref,sauliusg/jabref,JabRef/jabref,Siedlerchr/jabref,tobiasdiez/jabref,JabRef/jabref,sauliusg/jabref,zellerdev/jabref,sauliusg/jabref,zellerdev/jabref,zellerdev/jabref,zellerdev/jabref,zellerdev/jabref,JabRef/jabref,tobiasdiez/jabref