fix: Relax constraints on pip requirements (#2809)

letta/schemas/pip_requirement.py

@@ -1,23 +1,12 @@
-import re
 from typing import Optional
 
-from pydantic import BaseModel, Field, field_validator
+from pydantic import BaseModel, Field
 
 
 class PipRequirement(BaseModel):
     name: str = Field(..., min_length=1, description="Name of the pip package.")
     version: Optional[str] = Field(None, description="Optional version of the package, following semantic versioning.")
 
-    @field_validator("version")
-    @classmethod
-    def validate_version(cls, v: Optional[str]) -> Optional[str]:
-        if v is None:
-            return None
-        semver_pattern = re.compile(r"^\d+(\.\d+){0,2}(-[a-zA-Z0-9.]+)?$")
-        if not semver_pattern.match(v):
-            raise ValueError(f"Invalid version format: {v}. Must follow semantic versioning (e.g., 1.2.3, 2.0, 1.5.0-alpha).")
-        return v
-
     def __str__(self) -> str:
         """Return a pip-installable string format."""
         if self.version: