gh-36513: `networkx`, `scipy`, `ipywidgets`: Update version ranges in `conda.txt`
    
Just one commit split out from #35593.

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URL: #36513
Reported by: Matthias Köppe
Reviewer(s): Gonzalo Tornaría, Matthias Köppe, Tobias Diez

Author: Release Manager

build/pkgs/ipywidgets/distros/conda.txt

@@ -1 +1 @@
-ipywidgets<8.0.0
+ipywidgets>=7.5.1

build/pkgs/networkx/distros/conda.txt

@@ -1 +1 @@
-networkx<3.0,>=2.4
+networkx<3.2,>=2.4

build/pkgs/scipy/distros/conda.txt

@@ -1 +1 @@
-scipy<1.11,>=1.5
+scipy<1.12,>=1.5