chore: upgrade snakenet to polkadot v0.9.15

[enthusiastmartin]

fixes #357

[codecov]

Codecov Report

Merging #358 (5eaf03e) into master (8cdec0d) will decrease coverage by 13.69%.
The diff coverage is 60.00%.

@@            Coverage Diff             @@
##           master    #358       +/-   ##
==========================================
- Coverage   15.31%   1.61%   -13.70%     
==========================================
  Files          20       9       -11     
  Lines        6812    5635     -1177     
==========================================
- Hits         1043      91      -952     
+ Misses       5769    5544      -225     

Impacted Files	Coverage Δ
pallets/claims/src/benchmarking.rs	100.00% <ø> (ø)
pallets/claims/src/traits.rs	47.05% <ø> (ø)
pallets/genesis-history/src/lib.rs	50.00% <ø> (ø)
primitives/src/asset.rs	0.00% <ø> (-90.91%)	⬇️
primitives/src/lib.rs	68.75% <0.00%> (-16.97%)	⬇️
pallets/claims/src/lib.rs	79.59% <100.00%> (+3.12%)	⬆️
pallets/claims/src/migration.rs	63.63% <100.00%> (ø)
primitives/src/traits.rs	0.00% <0.00%> (-100.00%)	⬇️

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[enthusiastmartin]

@martinfridrich if you can have a look at the chain spec, that would be great.

[mrq1911]

• bump versions
• reuse from basilisk or remove completely asset registry, xyk and exchange