python-eventlet: bump to 0.40.4

Full release notes:
https://github.com/eventlet/eventlet/blob/master/NEWS

Signed-off-by: Alexandru Ardelean <alex@shruggie.ro>

lang/python/python-eventlet/test.sh

@@ -0,0 +1,20 @@
+#!/bin/sh
+
+[ "$1" = python3-eventlet ] || exit 0
+
+python3 - << 'EOF'
+import eventlet
+
+# Test basic green thread spawning
+results = []
+
+def worker(n):
+    results.append(n)
+
+pool = eventlet.GreenPool(size=4)
+for i in range(4):
+    pool.spawn(worker, i)
+pool.waitall()
+
+assert sorted(results) == [0, 1, 2, 3], f"Unexpected results: {results}"
+EOF