[PWGDQ] Fix compilation warnings (#8382)

Co-authored-by: ALICE Builder <alibuild@users.noreply.github.com>

Author: vkucera

PWGDQ/Core/MCProng.cxx

@@ -147,7 +147,7 @@ void MCProng::Print() const
     std::cout << "Generation #" << i << " PDGcode(" << fPDGcodes[i] << ") CheckBothCharges(" << fCheckBothCharges[i]
               << ") ExcludePDG(" << fExcludePDG[i] << ")  SourceBits(" << fSourceBits[i] << ") ExcludeSource(" << fExcludeSource[i]
               << ") UseANDonSource(" << fUseANDonSourceBitMap[i] << ") CheckGenerationsInTime(" << fCheckGenerationsInTime << ")";
-    for (int j = 0; j < fPDGInHistory.size(); j++) {
+    for (std::size_t j = 0; j < fPDGInHistory.size(); j++) {
       std::cout << " #" << j << " PDGInHistory(" << fPDGInHistory[j] << ") ExcludePDGInHistory(" << fExcludePDGInHistory[j] << ")";
     }
     std::cout << std::endl;

PWGDQ/TableProducer/tableMaker_withAssoc.cxx

@@ -1059,7 +1059,7 @@ struct TableMaker {
 
   // produce the muon-only DQ skimmed data model typically for pp/p-Pb or UPC Pb-Pb (no centrality), meant to run on skimmed data
   void processPPMuonOnly(MyEventsWithMults const& collisions, BCsWithTimestamps const& bcs,
-                         MyMuonsWithCov const& muons, FwdTrackAssoc const& fwdTrackAssocs, MFTTracks const& mftTracks)
+                         MyMuonsWithCov const& muons, FwdTrackAssoc const& fwdTrackAssocs, MFTTracks const& /*mftTracks*/)
   {
     fullSkimming<gkEventFillMapWithMults, 0u, gkMuonFillMapWithCov, 0u>(collisions, bcs, nullptr, nullptr, muons, nullptr, nullptr, fwdTrackAssocs, nullptr);
   }

PWGDQ/Tasks/mchAlignRecord.cxx

@@ -137,7 +137,7 @@ struct mchAlignRecordTask {
 
     // Configuration for chamber fixing
     auto chambers = fFixChamber.value;
-    for (int i = 0; i < chambers.length(); ++i) {
+    for (std::size_t i = 0; i < chambers.length(); ++i) {
       if (chambers[i] == ',')
         continue;
       int chamber = chambers[i] - '0';

PWGDQ/Tasks/tableReader_withAssoc.cxx

@@ -2490,7 +2490,6 @@ struct AnalysisDileptonTrack {
     bool isBarrelAsymmetric = context.mOptions.get<bool>("processDstarToD0Pi");
     bool isMuon = context.mOptions.get<bool>("processMuonSkimmed");
     bool isMuonME = context.mOptions.get<bool>("processMuonMixedEvent");
-    bool isAnyProcessEnabled = isBarrel || isBarrelME || isMuon || isMuonME;
 
     fCurrentRun = 0;
     fValuesDilepton = new float[VarManager::kNVars];