fix: adjust tiktoken version to ~=0.7.0 for dependency compatibility

- Update tiktoken dependency to ~=0.7.0 to resolve conflict with embedchain
- Maintain compatibility with crewai-tools dependency chain
- Addresses CI build failures

Co-Authored-By: Joe Moura <joao@crewai.com>

pyproject.toml

@@ -30,7 +30,7 @@ dependencies = [
     "pdfplumber>=0.11.4",
     "openpyxl>=3.1.5",
     "blinker>=1.9.0",
-    "tiktoken>=0.8.0",
+    "tiktoken~=0.7.0",
 ]
 
 [project.urls]