fix(ci): Pin msys2 to specific version otherwise install fails.
fix(ci): Pin msys2 to specific version otherwise install fails.

Fixes #3233

JGrothoff/open62541,jpfr/open62541,open62541/open62541,open62541/open62541,StalderT/open62541,JGrothoff/open62541,jpfr/open62541,JGrothoff/open62541,JGrothoff/open62541,open62541/open62541,StalderT/open62541,StalderT/open62541,jpfr/open62541,jpfr/open62541,open62541/open62541,StalderT/open62541