Bump AA to v0.45, Nemo to v0.50, Hecke to v0.36

[lgoettgens]

Release notes

per hand add the following to the respective sections:

Bump AbstractAlgebra to v0.45
Bump Nemo to v0.50
Bump Hecke to v0.36
Bump Polymake.jl to 0.12

[lgoettgens]

@thofma is this change here from Complex to Real intended like this?

[thofma]

Yes

[lgoettgens]

This should no longer have any errors in CI (I ran it on different servers with deperrors on and off, different julia versions, some CI jobs here succeeded in earlier iterations).

[codecov]

Codecov Report

Attention: Patch coverage is 90.00000% with 1 line in your changes missing coverage. Please review.

Project coverage is 84.88%. Comparing base (3ba302a) to head (af1ab20).
Report is 3 commits behind head on master.

Files with missing lines	Patch %	Lines
...raicGeometry/Surfaces/EllipticSurface/Morphisms.jl	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #4895      +/-   ##
==========================================
+ Coverage   84.81%   84.88%   +0.06%     
==========================================
  Files         683      683              
  Lines       91945    91859      -86     
==========================================
- Hits        77984    77975       -9     
+ Misses      13961    13884      -77     

Files with missing lines	Coverage Δ
experimental/CliffordAlgOrd/src/CliffordAlgebra.jl	83.81% <100.00%> (ø)
experimental/CliffordAlgOrd/src/CliffordOrder.jl	77.92% <100.00%> (ø)
experimental/GModule/src/GaloisCohomology.jl	67.59% <ø> (ø)
experimental/QAnalogs/src/QAnalogs.jl	100.00% <ø> (ø)
...ntal/QuadFormAndIsom/src/lattices_with_isometry.jl	99.71% <ø> (ø)
...ometry/Surfaces/EllipticSurface/EllipticSurface.jl	83.62% <100.00%> (ø)
...cGeometry/Surfaces/EllipticSurface/NeighborStep.jl	91.92% <100.00%> (ø)
...oricVarieties/NormalToricVarieties/constructors.jl	100.00% <ø> (ø)
src/Combinatorics/Graphs/functions.jl	93.12% <ø> (ø)
src/Misc/MoveToAbstractAlgebra.jl	83.33% <ø> (-8.98%)	⬇️
... and 12 more

... and 5 files with indirect coverage changes

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