Typo in error.context in ForPairs: inputValue used twice instead of inputKey and inputValue

In ForPairs, within the self._outputPairState function, the error.context uses inputValue twice, rather than inputKey and inputValue.
```lua
error.context = `while processing key {tostring(inputValue)} and value {tostring(inputValue)}`
```
The line should likely be:
```lua
error.context = `while processing key {tostring(inputKey)} and value {tostring(inputValue)}`
```