Fix for https://github.com/JuliaInterop/CxxWrap.jl/issues/419

[barche]

https://github.com/JuliaInterop/CxxWrap.jl.git

@PraneethJain I had to remove the explicit return type on std::queue::front to fix JuliaInterop/CxxWrap.jl#419, but I'm not sure why the return type was specified in the first place?

[PraneethJain]

I had included the explicit return types initially while referencing the diff for valarray, but on hindsight, it is not needed.

As for the tests, there seems to be some string parsing error due to the inclusion of the ` character. I'll look into it now.
https://docs.github.com/en/actions/security-guides/security-hardening-for-github-actions#understanding-the-risk-of-script-injections
Anything surrounded by back ticks is executed as a bash command, which is the issue here. Apologies for the oversight.

[barche]

Thanks for the reply, yes, I'm fixing the error by moving the body env var to the env block, no worries.