Update version of iperf3 from 3.6 to 3.16

[dmagdavector]

Steps to reproduce

Spack currently only explicitly has version 3.6 of the iPerf3 package (out of ESnet / LBNL). This makes the default the latest version of 3.16, and adds some other versions (found in some Linux distros, for possible compat purposes).

diff --git a/var/spack/repos/builtin/packages/iperf3/package.py b/var/spack/repos/builtin/packages/iperf3/package.py
index 162ea1b65a..aeca3aafcf 100644
--- a/var/spack/repos/builtin/packages/iperf3/package.py
+++ b/var/spack/repos/builtin/packages/iperf3/package.py
@@ -12,6 +12,10 @@ class Iperf3(AutotoolsPackage):
     maintained project."""
 
     homepage = "https://software.es.net/iperf/"
-    url = "https://github.com/esnet/iperf/archive/3.6.tar.gz"
+    url = "https://downloads.es.net/pub/iperf/iperf-3.16.tar.gz"
 
+    version("3.16", sha256="cc740c6bbea104398cc3e466befc515a25896ec85e44a662d5f4a767b9cf713e")
+    version("3.14", sha256="723fcc430a027bc6952628fa2a3ac77584a1d0bd328275e573fc9b206c155004")
+    version("3.12", sha256="72034ecfb6a7d6d67e384e19fb6efff3236ca4f7ed4c518d7db649c447e1ffd6")
+    version("3.9", sha256="24b63a26382325f759f11d421779a937b63ca1bc17c44587d2fcfedab60ac038")
     version("3.6", sha256="1ad23f70a8eb4b892a3cbb247cafa956e0f5c7d8b8601b1d9c8031c2a806f23f")

Error message

No response

Information on your system

• Spack: 0.21.0 (65d3221)
• Python: 3.10.12
• Platform: linux-ubuntu22.04-cascadelake
• Concretizer: clingo

General information

• I have run spack debug report and reported the version of Spack/Python/Platform
• I have searched the issues of this repo and believe this is not a duplicate
• I have run the failing commands in debug mode and reported the output

[Wouter Deconinck]

Would you be interested in contributing this change as a pull request? We would very much welcome this contribution, and it does not imply any future maintenance promise from you end. Feel free to ping me if you do, and I can give it a review.

[dmagdavector]

See pull/44152