⬆️ chore(deps): upgrade all dependencies to latest versions

Proactive dependency refresh. No open Dependabot alerts; this is a
"move everything to latest" pass.

Manifest change:
- whisperx 3.7.4 -> 3.8.6 (the only pinned entry)

The other entries (tiktoken, python-dotenv, openai, transformers) are
unpinned, so a fresh install already resolves to latest. Existing
pinning style is preserved rather than converting them to == pins.
Resolved versions on a clean install today:

- torch 2.8.0, torchaudio 2.8.0, torchvision 0.23.0
- numpy 2.5.1 (2.x; whisperx 3.8.6 requires numpy>=2.1.0)
- transformers 4.57.6
- openai 2.46.0
- tiktoken 0.13.0, python-dotenv 1.2.2
- pyannote-audio 4.0.7, faster-whisper 1.2.1, ctranslate2 4.8.1

transformers is held at 4.57.6, not 5.14.1: whisperx 3.8.6 requires
huggingface-hub<1.0.0 while transformers 5.x requires >=1.5.0. This is
an upstream conflict, not a local choice.

No source changes were needed. The openai 2.x call path
(chat.completions.create) and the tiktoken API used by
utils/token_counter.py are both unchanged.

Also gitignore __pycache__/ so verification runs don't dirty the tree.

Author: luiscosio

.gitignore

@@ -19,4 +19,8 @@ output/*
 
 # Environment configuration
 .env
-.venv
+.venv
+
+# Python build artifacts
+__pycache__/
+*.py[cod]

requirements.txt

@@ -1,4 +1,4 @@
-whisperx==3.7.4
+whisperx==3.8.6
 tiktoken
 python-dotenv
 openai