fix: add missing closing quote in replaceReducer error message

[JSap0914]

Summary

Closes #4890

Bug

The error thrown by replaceReducer when called with a non-function was missing a closing single-quote around the received type value in the error message.

Before:

Expected the nextReducer to be a function. Instead, received: 'null

After:

Expected the nextReducer to be a function. Instead, received: 'null'

Root Cause

In src/createStore.ts, the template literal ended with }\`` instead of }'``:

// Before (bug)
`Expected the nextReducer to be a function. Instead, received: '${kindOf(
  nextReducer
)}`

// After (fix)
`Expected the nextReducer to be a function. Instead, received: '${kindOf(
  nextReducer
)}'`

Every other analogous error message in createStore.ts correctly wraps the received type in single quotes:

• Expected the root reducer to be a function. Instead, received: '${kindOf(reducer)}'
• Expected the enhancer to be a function. Instead, received: '${kindOf(enhancer)}'
• Expected the listener to be a function. Instead, received: '${kindOf(listener)}'
• Expected the observer to be an object. Instead, received: '${kindOf(observer)}'

Verification

The existing test only checked a partial string prefix ('Expected the nextReducer to be a function.'), which passed even with the broken message. The updated test now asserts the full message including the received type wrapped in quotes, catching this class of regression.

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commit: 68f83ce