Bump LibExpat for LibExpat_jll binary support

[jeremiahpslewis]

No description provided.

[pszufe]

Hi,
thanks for that, however unit tests for ProtoBuf are failing ugly after this update.
Could you have a look?
https://app.travis-ci.com/github/pszufe/OpenStreetMapX.jl/jobs/560852995

[jeremiahpslewis]

@pszufe thanks for the feedback! In order to keep this PR focused on libexpat (and given that after looking into the protobuf issue, the fix seems extensive and unfamiliar), I've dropped the version bump on protobuf

[jeremiahpslewis]

Note: although this isn't expressly covered by the project CI, the PR passed on Mac OS Apple Silicon, Julia 1.7 :)

[pszufe]

I used to run Travis on MacOS. However at some point they change the rules.
Now there is credit budget for Open Source projects for CI. The problem is that MacOS eats 20x as much of budget as Linux. So when I run CI on MacOS I end up not being able to run Travis unit tests at all.
Thanks for the PR!

[jeremiahpslewis]

Thank you for the quick review and merge! :)