Fix: Throw CanNotResolve instead of ResolvedToRootSchema when JSON pointer is invalid

[localheinz]

This pull request

• throws a CanNotResolve exception instead of a ResolvedToRootSchema exception when a JSON pointer is not a valid URI fragment identifier

[codecov]

Codecov Report

Merging #202 (b655a16) into main (e05587c) will not change coverage.
The diff coverage is 100.00%.

@@            Coverage Diff            @@
##               main     #202   +/-   ##
=========================================
  Coverage     99.13%   99.13%           
  Complexity       35       35           
=========================================
  Files            12       12           
  Lines           116      116           
=========================================
  Hits            115      115           
  Misses            1        1           

Impacted Files	Coverage Δ
src/SchemaValidator.php	100.00% <100.00%> (ø)

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