python3-networkx: upgrade 2.5.1 -> 2.6.1

This release is the result of 11 months of work with over 363 pull requests by 91 contributors. Highlights include:
Dropped support for Python 3.6.
NumPy, SciPy, Matplotlib, and pandas are now default requirements.
NetworkX no longer depends on the library “decorator”.
Improved example gallery
Removed code for supporting Jython/IronPython
The __str__ method for graph objects is more informative and concise.
Improved import time
Improved test coverage
New documentation theme
Add functionality for drawing self-loop edges
Add approximation algorithms for Traveling Salesman Problem

New functions:
Panther algorithm
maximum cut heuristics
equivalence_classes
dedensification
random_ordered_tree
forest_str
snap_aggregation
networkx.approximation.diameter
partition_quality
prominent_group
prefix_tree_recursive
topological_generations

-License-Update: Copyright year updated to 2021.

Add runtime dependency to resolve errors that occurred when import networkx.

Signed-off-by: Zang Ruochen <zangrc.fnst@fujitsu.com>
Signed-off-by: Khem Raj <raj.khem@gmail.com>

meta-python/recipes-devtools/python/python3-networkx_2.6.1.bb

@@ -0,0 +1,19 @@
+DESCRIPTION = "Python package for creating and manipulating graphs and networks"
+HOMEPAGE = "http://networkx.github.io/"
+LICENSE = "BSD-3-Clause"
+LIC_FILES_CHKSUM = "file://LICENSE.txt;md5=5cfa4d8f5881e0d053bb497130b9c73a"
+
+SRC_URI[sha256sum] = "bf4cb807d1bccf1593c7d0742d9127d9e04e021867299082658b0fc3907924e8"
+
+inherit pypi setuptools3
+
+RDEPENDS_${PN} += "\
+                   ${PYTHON_PN}-decorator \
+                   ${PYTHON_PN}-netclient \
+                   ${PYTHON_PN}-compression \
+                   ${PYTHON_PN}-numbers \
+                   ${PYTHON_PN}-pickle \
+                   ${PYTHON_PN}-html \
+                   ${PYTHON_PN}-xml \
+                   ${PYTHON_PN}-json \
+                   "