Allow unnamed queries with variables

[lonelyteapot]

No description provided.

[codecov-commenter]

Codecov Report

Merging #21 (ff78197) into main (951bf64) will increase coverage by 0.67%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main      #21      +/-   ##
==========================================
+ Coverage   97.01%   97.69%   +0.67%     
==========================================
  Files           7        7              
  Lines         134      130       -4     
==========================================
- Hits          130      127       -3     
+ Misses          4        3       -1     

Impacted Files	Coverage Δ
pygraphic/_gql_query.py	100.00% <100.00%> (+3.33%)	⬆️

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