Update timestamp format to use UTC timezone

[adamoutler]

Remove deprecated API utilization.

Summary by CodeRabbit

• Bug Fixes
  • Speed test results now use timezone-aware UTC timestamps, preserving the ISO 8601 format with a Z suffix.
  • Ensures consistent behavior across environments and avoids potential timezone-related discrepancies.
  • Improves interoperability with systems expecting strict ISO 8601/RFC 3339 compliance.
  • Reduces risk of parsing issues in downstream integrations, logs, and exports.

[coderabbitai]

Walkthrough

Replaced naive UTC timestamp generation with timezone-aware UTC using datetime.now(timezone.utc) and normalized ISO 8601 format with a trailing Z via string replacement.

Changes

Cohort / File(s)	Summary
Timestamp handling update back/speedtest-cli/*	Switched from naive utcnow().isoformat() with manual 'Z' suffix to aware now(timezone.utc).isoformat().replace('+00:00','Z') for UTC timestamps.

Estimated code review effort

🎯 2 (Simple) | ⏱️ ~8 minutes

Poem

I nibbled time to make it wise,
Aware of UTC’s clear skies;
From naive ticks to Z-lit rhyme,
I stamped the truth on every time.
Hop hop—now logs align! 🐇⏱️

Pre-merge checks and finishing touches

✅ Passed checks (3 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title Check	✅ Passed	The title accurately and concisely describes the primary change of updating timestamp formatting to use UTC timezone, directly reflecting the switch to an aware UTC timestamp in the code. It is specific enough for a reviewer to understand the main purpose without extraneous detail. The phrasing is clear and focused on the core update.
Docstring Coverage	✅ Passed	No functions found in the changes. Docstring coverage check skipped.

✨ Finishing touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment

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📜 Recent review details

Configuration used: CodeRabbit UI

Review profile: CHILL

Plan: Pro

📥 Commits

Reviewing files that changed from the base of the PR and between 42eae40 and ab3f904.

📒 Files selected for processing (1)

• back/speedtest-cli (1 hunks)

⏰ Context from checks skipped due to timeout of 90000ms. You can increase the timeout in your CodeRabbit configuration to a maximum of 15 minutes (900000ms). (1)

• GitHub Check: docker_dev

🔇 Additional comments (1)

back/speedtest-cli (1)

960-960: LGTM — no remaining utcnow() usages
Verified no other occurrences of utcnow() in the codebase.

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