Regression in outputting single-quoted strings

[thatch]

Describe the bug

Somewhere between v4.35.2 and v4.45.1, yq outputting yaml started using the wrong number of single quotes (perhaps it thinks these can be simple scalars):

This input is valid yaml, and should be sent through unmodified:

$ echo "''" | yq .
''
$ echo "''''" | yq .
''''

What it does currently:

$ echo "''" | yq .

$ echo "''''" | yq .
'

Version of yq: v4.45.1
Operating system: Mac and Archlinux
Installed via: homebrew and https://archlinux.org/packages/extra/x86_64/go-yq/