Use graalvm with Java 20

[imkiva]

as title

[codecov]

Codecov Report

Merging #990 (e34db05) into main (179d7df) will not change coverage.
Report is 8 commits behind head on main.
The diff coverage is 50.00%.

@@            Coverage Diff            @@
##               main     #990   +/-   ##
=========================================
  Coverage     81.46%   81.46%           
  Complexity     3419     3419           
=========================================
  Files           281      281           
  Lines         10508    10508           
  Branches       1271     1271           
=========================================
  Hits           8560     8560           
  Misses         1229     1229           
  Partials        719      719           

Files Changed	Coverage Δ
pretty/src/main/java/org/aya/pretty/doc/Doc.java	94.40% <50.00%> (ø)

[imkiva]

bors merge

[bors]

Build succeeded!

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