A Phase I, Open-label, Non-randomised, Multi-center Dose Escalation Trial of BI 765049 Administered by Parenteral Route in Patients With Advanced, Unresectable, and/or Metastatic Colorectal Carcinoma (CRC), Gastric Carcinoma (GC), or Pancreatic Ductal Adenocarcinoma (PDAC) to Determine the MTD and the RP2D and to Determine the Dosing Regimen for Further Development of BI 765049 | Arctuva