gh-39676: update networkx to 3.4.2
    
With the update of numpy and scipy (#39655), we can update networkx to
version 3.4.2.

### 📝 Checklist

<!-- Put an `x` in all the boxes that apply. -->

- [x] The title is concise and informative.
- [x] The description explains in detail what this PR is about.
- [ ] I have linked a relevant issue or discussion.
- [ ] I have created tests covering the changes.
- [ ] I have updated the documentation and checked the documentation
preview.

### ⌛ Dependencies

#39655
    
URL: #39676
Reported by: David Coudert
Reviewer(s): Dima Pasechnik

Author: Release Manager

build/pkgs/networkx/checksums.ini

@@ -1,4 +1,4 @@
 tarball=networkx-VERSION.tar.gz
-sha1=b12cf95ed8bc3fe568e3c8e023473a3767c43f8d
-sha256=9f1bb5cf3409bf324e0a722c20bdb4c20ee39bf1c30ce8ae499c8502b0b5e0c6
+sha1=360c74c3e1a67e1cbd7bcc6f698bb89f615fd800
+sha256=307c3669428c5362aab27c8a1260aa8f47c4e91d3891f48be0141738d8d053e1
 upstream_url=https://files.pythonhosted.org/packages/source/n/networkx/networkx-VERSION.tar.gz

build/pkgs/networkx/package-version.txt

@@ -1 +1 @@
-3.2.1
+3.4.2