python312Packages.pwlf: fix src tag

cjekel/piecewise_linear_fit_py#121 (comment)

Author: doronbehar

pkgs/development/python-modules/pwlf/default.nix

@@ -18,7 +18,7 @@ buildPythonPackage rec {
   src = fetchFromGitHub {
     owner = "cjekel";
     repo = "piecewise_linear_fit_py";
-    tag = "v.${version}";
+    tag = "v${version}";
     hash = "sha256-TamFg+bX8QPRjY0HdrYviJRP8VwM7ucDFE2eZz5xNr0=";
   };