Update opensuse.yaml with correct update repos

[mimi1vx]

openSUSE from Leap 15.3 changed structure of update repos with full binary compatibility with SLE + removed out of support distributions

[AMDmi3]

Please drop repository removals from this PR, these won't be accepted

[mimi1vx]

@AMDmi3 why? Leap 42.3 + Leap 15.0-15.2 are dead and only polute results and page with obsolete data. And in the end gives wrong impressions about totally outdated openSUSE ...

[AMDmi3]

For history and for these who still use these repositories.

[mimi1vx]

For history and for these who still use these repositories.

history ok, this is valid, usage of this repos is, how to say, total stupidity?

[mimi1vx]

@AMDmi3 now, with only with fixes for Leap 15.3/Leap 15.4

[AMDmi3]

As repository config was changed, this needs to be updated. There's no need to update the PR, I can just add backports and sle to the new config, the question though is whether these repositories are enabled in the default configuration.

[mimi1vx]

@AMDmi3 .. question is simple .. distribution is based on this. So its enabled by default.

[AMDmi3]

Sorry, I've forgot about this and it has rot somewhat. Remaining relevant part was about adding backports and sle subrepos, and I've added these in c68343d74363f278c0afb56c7af70d2ba4039b2d