cargo: upgrade xen libraries

[Wenzel]

fix unwrap when loading xen libraries:
Wenzel/xenstore#8
Wenzel/xenevtchn#11
Wenzel/xenctrl#41
Wenzel/xenforeignmemory#9

[codecov-commenter]

Codecov Report

Merging #228 (c569b35) into master (70ea066) will not change coverage.
The diff coverage is n/a.

❗ Current head c569b35 differs from pull request most recent head 34240e0. Consider uploading reports for the commit 34240e0 to get more accurate results

@@           Coverage Diff           @@
##           master     #228   +/-   ##
=======================================
  Coverage   15.24%   15.24%           
=======================================
  Files          10       10           
  Lines         610      610           
  Branches      100      100           
=======================================
  Hits           93       93           
  Misses        499      499           
  Partials       18       18           

Flag	Coverage Δ
unittests	15.24% <ø> (ø)

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