🐛 Bug Report: Cannot update documents created with a null field whose attribute name contains a period

### 👟 Reproduction steps

In the Appwrite Console:
- Create a new collection
- Add a nullable attribute with the name containing a period
- Create a document in the collection with a null value for the above attribute
- Try to update the document data after its creation

### 👍 Expected behavior

The document data should update.

### 👎 Actual Behavior

Throws an error: "Invalid document structure: Unknown attribute"


### 🎲 Appwrite version

Version 1.5.x

### 💻 Operating system

Linux

### 🧱 Your Environment

Appwrite 1.5.4
Docker 24.0.2
Ubuntu 22.04.2 LTS

### 👀 Have you spent some time to check if this issue has been raised before?

- [X] I checked and didn't find similar issue

### 🏢 Have you read the Code of Conduct?

- [X] I have read the [Code of Conduct](https://github.com/appwrite/.github/blob/main/CODE_OF_CONDUCT.md)