mw: fix transform middleware regression with XML #1166
Merged
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This was a crash in the mxj library concerning invalid input from a
reader, as it would not properly error and stop. We did not hit this
before in 2.3.x as we used a []byte, not an io.Reader.
The upstream issue is clbanning/mxj#38, fixed
back in February.
Add a regression test and bump the vendored version.
Fixes #1122.