Encoding ignored

[mcp292]

Describe the bug The encoding argument seems to be ignored.

To Reproduce

1. Save this image as file.png:

2. Run:

   
   import textract

print(textract.process("file.png"), "\n") print(textract.process("file.png", encoding="ascii"), "\n") print(textract.process("file.png", encoding="nonexistent encoding"), "\n")

**Expected behavior**
I would expect the output of the above to differ. I would expect `ascii` to not be output as a byte string. I would expect `nonexistent encoding` to error or warn and ignore.

**Desktop (please complete the following information):**
 - OS: Fedora 40
 - Textract version: 1.6.5
 - Python version: 3.12.4
 - Virtual environment: no

**Additional context**
Haven't tested commandline.