bump JSON compat

[hhaensel]

As JSON3 has. been deprecated and people are moving to use the new v1 of JSON, I propose to bump the compat entry.
JSON.parse() now returns a JSON.Object by default. So in order to make the PR non-breaking, I forced dicttype=Dict{String,Any} for parsing.
This restriction could be released in a later version.

[codecov-commenter]

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Codecov Report

❌ Patch coverage is 25.00000% with 3 lines in your changes missing coverage. Please review.
✅ Project coverage is 42.74%. Comparing base (017806e) to head (ea29128).
⚠️ Report is 4 commits behind head on master.

Files with missing lines	Patch %	Lines
src/OpenIDConnect.jl	25.00%	3 Missing ⚠️
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Additional details and impacted files

@@            Coverage Diff             @@
##           master      #24      +/-   ##
==========================================
- Coverage   50.45%   42.74%   -7.72%     
==========================================
  Files           1        1              
  Lines         109      131      +22     
==========================================
+ Hits           55       56       +1     
- Misses         54       75      +21     

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[hhaensel]

@tanmaykm what do you think?

[tanmaykm]

Thanks @hhaensel !

[hhaensel]

Thank you for merging and releasing 😀