Fix ros.isolateEnvironment type

[dackjavidson]

Update package.json to use the proper JSON type name for a boolean: "bool" -> "boolean". This fixes a minor bug where devcontainer.json complains about the input value no matter what you put, because it can't return a "bool", only a "boolean".

Before:

After:

[dackjavidson]

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[ooeygui]

Great Catch! Thank you for the contribution!