Add MC23 HI run number and timestamp to dictionaries
Adding the run number and timestamp for the upcoming HI MC production to the dictionary, which is needed to e.g. prepare the conditions, collected in ATLGBLCONDTAGS-151
The values were also added to the relevant twiki: https://twiki.cern.ch/twiki/bin/view/AtlasComputing/ConditionsRun1RunNumbers#RUN_2_RUN_3_and_RUN_4
Tagging @jchapman @tscanlon @jmaurer @tlari @mbandier @schaarsc @hgray @jferrand