Increment erlavro to avoid rebar2 issue.

[chriseyre2000]

erlavro 2.9.8 is no longer dependent upon Rebar2 (which will cause deprecation warnings).

[Strech]

Hi @chriseyre2000 👋🏼

Thanks for your contribution, let me check what changed and we can merge it

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UPD: Ok, so in 2.9.8 erlavro dropped rebar2 support. I'm not sure how it will impact projects using Avrora, but going to do some quick research.

I notice that tests are failing too ...

[Strech]

I've checked the dependencies and it's available for an update which means that you just need to execute locally this

mix deps.update erlavro

to update the version lock inside your project. There is no need to update the version in the Avrora