sagemath: update to 10.6.

[tornaria]

• New package: sagemath-giac-0.1.1
• sagemath: update to 10.6.beta9.

Testing the changes

• I tested the changes in this PR: briefly

[tornaria]

@dkwo here's a current beta of sagemath if you want to test it.

Note: support for giac has been split to a separate package sagemath-giac. It is safe to ignore it. The new package sagemath-giac build-depends on sagemath, installing it adds some integration algorithms (I think it gives better answers for some integrals). I don't know what happens when we upgrade sagemath I expect most of the time sagemath-giac can be left alone but we'll see.

[tornaria]

@leahneukirchen this is good to go (and, if you are feeling in the mood, #54606, #54607, #54608, #54609 are related packages, although they don't need to be updated in sync)

[tornaria]

Also cc: @dkwo

[dkwo]

Thanks! I'll try to build and test on aarch64 today and report.

[dkwo]

builds and installs fine. now running the test suite.

[dkwo]

My bad, once again I forgot to install checkdepends.

[dkwo]

All is good on aarch64 :)