test(@stdlib/net/http2-secure-server): renew expired TLS certificates

[Planeshifter]

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Description

The self-signed localhost certificate used in test fixtures and examples for @stdlib/net/http2-secure-server expired on September 15, 2025. Node.js TLS validation rejects the expired certificate, causing the test suite to fail in CI.

This PR regenerates both keypairs (test fixtures and examples) with:

• Validity: 10 years (expires June 1, 2036)
• Algorithm: RSA-2048
• Subject: CN=localhost
• SAN extension: DNS:localhost, IP:127.0.0.1 (required for modern TLS hostname validation)

Files changed

File	Change
test/fixtures/localhost-cert.pem	Renewed certificate (was notAfter=Sep 15 2025)
test/fixtures/localhost-privkey.pem	Matching private key
examples/localhost-cert.pem	Renewed certificate (was notAfter=Sep 15 2025)
examples/localhost-privkey.pem	Matching private key

Root cause

The original certificates were generated with a 30-day validity period and expired ~8 months ago. No code logic changes are needed — only the certificate material itself.

Related Issues

CI failures on the develop branch: test suite for @stdlib/net/http2-secure-server exits with TLS CERT_HAS_EXPIRED errors.

Questions

• Is this a work in progress? Yes (draft PR; pending CI validation)

---

AI Disclosure: This pull request was prepared with the assistance of an AI coding assistant (Claude). The certificate regeneration was performed using standard openssl req -x509 tooling. The AI reviewed the test fixture usage in test/test.js and confirmed the fix is scoped to certificate renewal only — no logic changes.

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Coverage Report

Package	Statements	Branches	Functions	Lines
net/http2-secure-server	$\color{red}413/418$ $\color{green}+98.80\%$	$\color{red}48/50$ $\color{green}+96.00\%$	$\color{red}5/6$ $\color{green}+83.33\%$	$\color{red}413/418$ $\color{green}+98.80\%$

The above coverage report was generated for the changes in this PR.