Limit github action access

[jwillemsen]

* .github/workflows/fuzzr.yml:
* .github/workflows/linux.yml:
* .github/workflows/windows.yml:

[codecov]

Codecov Report

Merging #214 (f266485) into master (3865c02) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #214   +/-   ##
=======================================
  Coverage   59.60%   59.60%           
=======================================
  Files         572      572           
  Lines       47515    47515           
  Branches     4187     4187           
=======================================
  Hits        28322    28322           
  Misses      16121    16121           
  Partials     3072     3072           

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