Fix MC-139908

This mod fix MC-139908

A description of MC-139908

In entity selectors, the advancement selector has support for testing that certain criteria are set or unset. When parsing the selector, these can only be parsed successfully if they are made up of a limited subset of characters.

How to reproduce
Attempt to run either of the following two commands:

/execute if entity @s[advancements={minecraft:adventure/adventuring_time={"minecraft:bamboo_jungle_hills"=true}}]

/execute if entity @s[advancements={minecraft:adventure/adventuring_time={minecraft:bamboo_jungle_hills=true}}]
Expected behavior

There should not be a parsing error. For example, the following the following similar command parses successfully.

/execute if entity @s[advancements={minecraft:adventure/ol_betsy={shot_crossbow=true}}]
Actual behavior

There is a parsing error (Expected "=")