Incorrect parsing of newlines within single quotes

[liamlundy]

Loading data with newlines in single quotes doesn't behave according to the YAML specification. For example:

f = """
test: 'this is a single quoted 
      string'"""
YAML.load(f)

returns

Dict{Any, Any} with 1 entry:
  "test" => "this is a single quoted\nstring"

instead of

Dict{Any, Any} with 1 entry:
  "test" => "this is a single quoted string"

Version info:

Julia Version 1.9.1
Commit 147bdf428cd (2023-06-07 08:27 UTC)
Platform Info:
  OS: macOS (x86_64-apple-darwin22.4.0)
  CPU: 10 × Apple M1 Pro
  WORD_SIZE: 64
  LIBM: libopenlibm
  LLVM: libLLVM-14.0.6 (ORCJIT, westmere)
  Threads: 1 on 10 virtual cores

using YAML v0.4.12

[liamlundy]

Additional YAML multiline info for reference: https://yaml-multiline.info/