chore: update loader to v0.5.2

[liuq19]

Summary

• update the root module dependency from loader v0.5.1 to v0.5.2
• refresh the loader module checksums
• consume the independently published Go 1.27-compatible loader from feat(loader): support Go 1.27 #965

This dependency-only change is intentionally separate from the root Go 1.27 build-tag and compatibility changes in #957.

Validation

• GOWORK=off GOTOOLCHAIN=go1.25.12 go test -race -gcflags="all=-l" ./... -count=1
• GOWORK=off GOTOOLCHAIN=go1.25.12 SONIC_USE_OPTDEC=1 SONIC_USE_FASTMAP=1 SONIC_ENCODER_USE_VM=1 go test ./... -count=1
• verified github.com/bytedance/sonic/loader v0.5.2 resolves from the module cache rather than the workspace module

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 51.25%. Comparing base (59be92f) to head (98053d8).
⚠️ Report is 84 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #968      +/-   ##
==========================================
- Coverage   51.86%   51.25%   -0.62%     
==========================================
  Files         127      170      +43     
  Lines       10893    14145    +3252     
==========================================
+ Hits         5650     7250    +1600     
- Misses       4920     6504    +1584     
- Partials      323      391      +68     

Flag	Coverage Δ
arm	42.88% <ø> (?)
macos-15	44.03% <ø> (?)
ubuntu-24.04-arm	42.88% <ø> (?)
ubuntu-latest	49.72% <ø> (?)
x86	49.72% <ø> (?)

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[Copilot]

Pull request overview

Updates the root Go module’s dependency on github.com/bytedance/sonic/loader to the published v0.5.2 release, aligning the main module with the Go 1.27-compatible loader work referenced in #965 while keeping the change isolated from broader Go 1.27 compatibility work in #957.

Changes:

• Bump github.com/bytedance/sonic/loader from v0.5.1 to v0.5.2 in go.mod.
• Refresh go.sum entries to match the updated loader version.

Reviewed changes

Copilot reviewed 1 out of 2 changed files in this pull request and generated no comments.

File	Description
go.mod	Updates the root module requirement for github.com/bytedance/sonic/loader to v0.5.2.
go.sum	Updates module checksums to correspond to github.com/bytedance/sonic/loader v0.5.2.

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