PHS: fix segfault when reading TRU flags in AltroDecoder.cxx

[sevdokim]

Hi! This is fix for seg fault when reading TRU flags in AltroDecoder.cxx

#1  o2::phos::AltroDecoder::readTRUFlags (this=0x5f99a00, hwAddress=2162, payloadSize=562) at /local/workspace/DailyBuilds/WeeklyO2Release/daily-tags.twINNhnLlC/SOURCES/O2/epn-20240419/epn-20240419/Detectors/PHOS/reconstruction/src/AltroDecoder.cxx:348

[github-actions[bot]]

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[sevdokim]

@peressounko can you please have a look?

[sevdokim]

Hi @shahor02 can you please look at this PR? Seems that some checks failed due to unrelated reasons. Thanks!