Dockerfile: update Xdebug from 3.0.4 to 3.1.1 (#1179)
Dockerfile: update Xdebug from 3.0.4 to 3.1.1 (#1179)

Xdebug 3.1 is the first version to support PHP 8.1.
hemberger/smr,hemberger/smr,smrealms/smr,smrealms/smr,hemberger/smr,hemberger/smr,smrealms/smr