fix: update remaining actions/checkout versions from 3 to 4

[JoshuaKGoldberg]

PR Checklist

• Addresses an existing open issue: fixes 🛠 Tooling: Migration end-to-end tests are failing on main #796
• That issue was marked as status: accepting prs
• Steps in CONTRIBUTING.md were taken

Overview

Turns out it was failing over diffs like:

diff --git a/.github/workflows/tsc.yml b/.github/workflows/tsc.yml
index 3b20f24..0e11a07 100644
--- a/.github/workflows/tsc.yml
+++ b/.github/workflows/tsc.yml
@@ -2,7 +2,7 @@ jobs:
   type_check:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v3
       - uses: ./.github/actions/prepare
       - run: pnpm tsc

You can see them by downloading the raw logs artifacts from the failing builds.

[codecov]

Codecov Report

Merging #831 (acb1c0a) into main (d3b4c85) will not change coverage.
The diff coverage is 60.00%.

@@           Coverage Diff           @@
##             main     #831   +/-   ##
=======================================
  Coverage   91.61%   91.61%           
=======================================
  Files          84       84           
  Lines        4161     4161           
  Branches      248      248           
=======================================
  Hits         3812     3812           
  Misses        349      349           

Flag	Coverage Δ
create	72.04% <60.00%> (ø)
initialize	34.08% <0.00%> (ø)
migrate	73.35% <60.00%> (ø)
unit	47.70% <20.00%> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.

Files Changed	Coverage Δ
src/steps/writing/creation/dotGitHub/workflows.ts	88.33% <50.00%> (ø)
...s/writing/creation/dotGitHub/createWorkflowFile.ts	100.00% <100.00%> (ø)

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[github-actions]

🎉 This is included in version v1.29.39 🎉

The release is available on:

• GitHub releases
• npm package (@latest dist-tag)

Cheers! 📦🚀