Update dockerfiles

[jackreeceejini]

Update Python version in Dockerfile-s #6175

[pavoljuhas]

Can you please also update the topdir Dockerfile?

[jackreeceejini]

#6167 seems to have done it last week. I see it in my fork wonder why it still shows as 3.8 from the link you sent

[pavoljuhas]

#6167 seems to have done it last week. I see it in my fork wonder why it still shows as 3.8 from the link you sent

Ah, that is a link to an old version, sorry about that.