bump mainline edge to rc5

[EvilOlaf]

Description

• rewrite rockchip64 patches: no changes
• rewrite meson64 patches: no changes
• rewrite uefi-arm64 patches: no changes
• rewrite loong64 patches: wasn't possible due to lack of sid build host. Anyone else need to do this

How Has This Been Tested?

• build kernel for orangepi5 as rockchip64 edge target
• build kernel for uefi-arm64

Checklist:

• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• My changes generate no new warnings
• Any dependent changes have been merged and published in downstream modules

Summary by CodeRabbit

• Chores
  • Updated mainline kernel version from 6.18-rc4 to 6.18-rc5 for upstream release candidate selection.

[coderabbitai]

Walkthrough

A kernel release candidate version bump for the 6.18 kernel series, updating the upstream RC tag from rc4 to rc5 in the configuration file config/sources/mainline-kernel.conf.sh. No logic changes or control flow modifications.

Changes

Cohort / File(s)	Summary
Kernel RC Version Update config/sources/mainline-kernel.conf.sh	Updated KERNELBRANCH assignment from tag:v6.18-rc4 to tag:v6.18-rc5 in the mainline_kernel_decide_version__upstream_release_candidate_number() function for KERNEL_MAJOR_MINOR 6.18

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~2 minutes

• Single-line configuration value change with no logic modifications
• Straightforward RC tag version increment

Possibly related PRs

• rockchip64: bump edge to 6.18-rc4, rewrite patches #8864: Directly updates the same 6.18 RC tag assignment from rc4 to rc5
• mainline-kernel: bump 6.18 to 6.18-rc3 #8830: Also modifies the 6.18 kernel KERNELBRANCH RC tag in the same function
• bump edge to 6.16.0-rc7 #8406: Updates KERNELBRANCH RC tags for different kernel versions following the same pattern

Suggested labels

08, Build, Patches, size/medium

Suggested reviewers

• igorpecovnik
• amazingfate
• brentr
• clee

Poem

🐰 From rc4 to rc5, a hop and a bound,
The kernel's new candidate comes around,
One little change, so simple and neat,
Makes Linux builds just that bit sweet! 🌰

Pre-merge checks and finishing touches

✅ Passed checks (3 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title 'bump mainline edge to rc5' accurately describes the main change: updating the kernel release candidate from rc4 to rc5 for the mainline edge branch.
Docstring Coverage	✅ Passed	Docstring coverage is 100.00% which is sufficient. The required threshold is 80.00%.
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.

✨ Finishing touches

• 📝 Generate docstrings

🧪 Generate unit tests (beta)

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

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[github-actions]

✅ This PR has been reviewed and approved — all set for merge!

[rpardini]

Thanks. I did all the rewrites (incl loong64) and no changes were produced.