Prepare for release 7.0.2

[phil-davis]

This should not break any consumer. For anyone already using v7, it will report some types more accurately and so their consumer-code will be better analyzed by phpstan.

Note: most consumers will currently be using sabre/http along with sabre/dav and other sabre-io components. So the dependency requirements of the current sabre/dav 4.4.0 will pull in sabre/http 5.1.7 anyway. So there are probably not many projects using sabre/http major version 7 yet anyway.

Eventually I will work through the type-declarations and phpstan level 9 throughout the sabre-io repos - I have some work in vobject that I need to get back to, and then try the main sabre/dav repo. And then we can do a set of major releases of all that...

[codecov]

Codecov Report

Merging #213 (ecf945f) into master (5220b2b) will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff            @@
##             master     #213   +/-   ##
=========================================
  Coverage     94.21%   94.21%           
  Complexity      260      260           
=========================================
  Files            15       15           
  Lines           881      881           
=========================================
  Hits            830      830           
  Misses           51       51           

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