[fix] Remove invalid escape sequence warnings in OpenWrt strings

[yassinekolsi]

Summary
This PR removes Python 3.12+ invalid escape sequence SyntaxWarnings in OpenWrt upgrader/test strings.

Changes

• Converted OpenWrt false-positive regex patterns to raw strings to avoid invalid escape warnings.
• Updated false-positive regex patterns to match both escaped and unescaped path variants (e.g. /tmp and /tmp), preserving intended suppression behavior.
• Simplified OpenWrt test fixture strings by removing unnecessary escaped forward slashes.

Behavior impact
No intended functional behavior change beyond keeping false-positive matching robust across escaped/unescaped log formats.

Validation

• Before (warnings reproduced):
  • python3 -W default -m py_compile openwisp_firmware_upgrader/upgraders/openwrt.py openwisp_firmware_upgrader/tests/test_openwrt_upgrader.py
• After (clean):
  • python3 -W error::SyntaxWarning -m py_compile openwisp_firmware_upgrader/upgraders/openwrt.py openwisp_firmware_upgrader/tests/test_openwrt_upgrader.py

Checklist

• Read contributing guidelines.
• Manually validated changes.
• Updated test fixtures as needed.
• Documentation update not needed for this housekeeping fix.

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📥 Commits

Reviewing files that changed from the base of the PR and between c142d19 and fee6be3.

📒 Files selected for processing (2)

• openwisp_firmware_upgrader/tests/test_openwrt_upgrader.py
• openwisp_firmware_upgrader/upgraders/openwrt.py

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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[Copilot]

Pull request overview

This PR removes Python 3.12+ SyntaxWarning: invalid escape sequence warnings by updating OpenWrt upgrader false-positive regex patterns and related test fixture strings, while keeping the false-positive suppression behavior compatible with both escaped and unescaped log formats.

Changes:

• Converted OpenWrt upgrader false-positive regex patterns to raw strings to eliminate invalid escape sequence warnings.
• Adjusted the regex patterns to match both escaped (\/tmp) and unescaped (/tmp) path variants.
• Simplified the OpenWrt upgrader test fixture error strings by removing unnecessary escaped forward slashes.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 1 comment.

File	Description
openwisp_firmware_upgrader/upgraders/openwrt.py	Updates false-positive regex patterns (raw strings + optional escaped slash handling) used to suppress known sysupgrade “false failure” errors.
openwisp_firmware_upgrader/tests/test_openwrt_upgrader.py	Updates the mocked sysupgrade failure message fixture to avoid invalid escape warnings by using unescaped paths.

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[Copilot]

The new false-positive suppression regex is intended to match both escaped (e.g. \/tmp) and unescaped (/tmp) path variants, but this test fixture now only exercises the unescaped form. Add a second test case (or parameterize this helper/test) that raises a CommandFailedException message containing literal backslashes before slashes so the escaped-log variant is covered and the new regex behavior is locked in.