Fix size parameter of FPDF.set_font_size (#8234)

Author: srittau

stubs/fpdf2/fpdf/fpdf.pyi

@@ -247,7 +247,7 @@ class FPDF:
         self, family: str, style: _FontStyle = ..., fname: str | None = ..., uni: bool | Literal["DEPRECATED"] = ...
     ) -> None: ...
     def set_font(self, family: str | None = ..., style: _FontStyles = ..., size: int = ...) -> None: ...
-    def set_font_size(self, size: int) -> None: ...
+    def set_font_size(self, size: float) -> None: ...
     font_stretching: float
     def set_stretching(self, stretching: float) -> None: ...
     def add_link(self) -> int: ...