First Principles Investigation of the Elastic, Optoelectronic and Thermal Properties of XRuSb: (X = V, Nb, Ta) Semi-Heusler Compounds Using the mBJ Exchange Potential by Bencherif, K., Yakoubi, A., Della, N., Miloud Abid, O., Khachai, H., Ahmed, R., Khenata, R., Bin Omran, S., Gupta, S. K., Murtaza, G.