Update Autofac.Multitenant for Autofac v7 support

[alistairjevans]

Fixes #32

[codecov]

Codecov Report

Patch coverage has no change and project coverage change: -1.20 ⚠️

Comparison is base (5d25233) 85.91% compared to head (f834dcb) 84.72%.

❗ Current head f834dcb differs from pull request most recent head 67d7834. Consider uploading reports for the commit 67d7834 to get more accurate results

Additional details and impacted files

@@             Coverage Diff             @@
##           develop      #33      +/-   ##
===========================================
- Coverage    85.91%   84.72%   -1.20%     
===========================================
  Files            5        5              
  Lines          142      144       +2     
  Branches        26       26              
===========================================
  Hits           122      122              
- Misses          12       14       +2     
  Partials         8        8              

Impacted Files	Coverage Δ
src/Autofac.Multitenant/MultitenantContainer.cs	83.96% <0.00%> (-1.31%)	⬇️

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[tillig]

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