chore: upgrade to go1.23

[DecFox]

This diff upgrades netem to use go1.23

[coveralls]

Pull Request Test Coverage Report for Build 17491537931

Details

• 144 of 162 (88.89%) changed or added relevant lines in 6 files are covered.
• 6 unchanged lines in 3 files lost coverage.
• Overall coverage decreased (-0.1%) to 84.866%

---

Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
dpidrop.go	29	31	93.55%
dpithrottle.go	30	32	93.75%
dissect.go	7	10	70.0%
tlsparse.go	13	16	81.25%
dpiblock.go	64	72	88.89%

Files with Coverage Reduction	New Missed Lines	%
linkfwddelay.go	2	94.29%
pcap.go	2	84.75%
router.go	2	81.25%

Totals
Change from base Build 7827800873:	-0.1%
Covered Lines:	2501
Relevant Lines:	2947

---

💛 - Coveralls