Update with new version of MultivariateMoments

[codecov[bot]]

Codecov Report

Patch coverage: 43.75% and project coverage change: -0.26 :warning:

Comparison is base (0966033) 83.86% compared to head (9dc1ae6) 83.60%.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #312 +/- ## ========================================== - Coverage 83.86% 83.60% -0.26% ========================================== Files 41 41 Lines 2181 2190 +9 ========================================== + Hits 1829 1831 +2 - Misses 352 359 +7 ``` | [Impacted Files](https://app.codecov.io/gh/jump-dev/SumOfSquares.jl/pull/312?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=jump-dev) | Coverage Δ | | |---|---|---| | [src/gram\_matrix.jl](https://app.codecov.io/gh/jump-dev/SumOfSquares.jl/pull/312?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=jump-dev#diff-c3JjL2dyYW1fbWF0cml4Lmps) | `83.87% <25.00%> (-6.83%)` | :arrow_down: | | [src/constraint.jl](https://app.codecov.io/gh/jump-dev/SumOfSquares.jl/pull/312?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=jump-dev#diff-c3JjL2NvbnN0cmFpbnQuamw=) | `75.39% <100.00%> (+0.39%)` | :arrow_up: | | [src/sos\_polynomial.jl](https://app.codecov.io/gh/jump-dev/SumOfSquares.jl/pull/312?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=jump-dev#diff-c3JjL3Nvc19wb2x5bm9taWFsLmps) | `85.10% <100.00%> (ø)` | |

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