python-gevent: update to 26.4.0; add test.sh

Bump version 25.9.1 -> 26.4.0.
Add test.sh to verify greenlet spawning and joining.

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

lang/python/python-gevent/test.sh

@@ -0,0 +1,21 @@
+#!/bin/sh
+
+[ "$1" = python3-gevent ] || exit 0
+
+python3 - << 'EOF'
+import gevent
+from gevent import sleep, spawn, joinall
+
+results = []
+
+def worker(n):
+    sleep(0)
+    results.append(n)
+
+jobs = [spawn(worker, i) for i in range(3)]
+joinall(jobs)
+
+assert sorted(results) == [0, 1, 2], f"Expected [0,1,2], got {results}"
+
+print("python3-gevent OK")
+EOF