Fix schema evolution

With commit 892f01a1 from 23.03.22 the layout of the data class CbmTsEventHeader was changed by adding a new data member. At that time it was forgotten to also increase the version number. This commit increases the version number and corrects the issue.

core/data/CbmTsEventHeader.h

@@ -110,6 +110,6 @@ protected:
   /** @brief nDigis in "this" timeslice measured by the BMON */
   uint64_t fNDigisBmon = 0;
 
-  ClassDef(CbmTsEventHeader, 6)
+  ClassDef(CbmTsEventHeader, 7)
 };
 #endif