feat!: bump minimum Node version to 18.12 and TypeScript to 4.8.4

[JoshuaKGoldberg]

PR Checklist

• Addresses an existing open issue: fixes 🚀 Feature: Drop support for Node 16 #530; fixes 🚀 Feature: Drop support for TypeScript < 4.8.4 #532
• That issue was marked as status: accepting prs
• Steps in CONTRIBUTING.md were taken

Overview

Removes the following methods that rely on deprecated parts of TypeScript:

• isInputFiles (ts.SyntaxKind.InputFiles)
• isUnparsedPrologue (ts.SyntaxKind.UnparsedPrologue)
• isUnparsedSourceText (ts.isUnparsedPrepend, ts.isUnparsedTextLike)
• isUnparsedSyntheticReference (ts.SyntaxKind. UnparsedSyntheticReference)

Also bumps all devDependencies to latest (ncu -u) to work on the latest Node 22 and 23 in CI.

💖

[codecov]

Codecov Report

Attention: Patch coverage is 58.03279% with 128 lines in your changes missing coverage. Please review.

Project coverage is 75.50%. Comparing base (c87c47b) to head (8911a4f).
Report is 10 commits behind head on main.

Files with missing lines	Patch %	Lines
src/nodes/access.ts	35.00%	52 Missing ⚠️
src/usage/UsageWalker.ts	56.98%	40 Missing ⚠️
src/usage/getUsageDomain.ts	70.49%	18 Missing ⚠️
src/compilerOptions.ts	85.71%	4 Missing ⚠️
src/scopes.ts	55.55%	4 Missing ⚠️
src/comments.ts	0.00%	3 Missing ⚠️
src/usage/Scope.ts	0.00%	3 Missing ⚠️
src/types/utilities.ts	0.00%	2 Missing ⚠️
src/nodes/utilities.ts	0.00%	1 Missing ⚠️
src/usage/utils.ts	66.66%	1 Missing ⚠️

❗ There is a different number of reports uploaded between BASE (c87c47b) and HEAD (8911a4f). Click for more details.

HEAD has 3 uploads less than BASE

Flag	BASE (c87c47b)	HEAD (8911a4f)
4.6.4	1	0
4.9.5	1	0
4.3.5	1	0

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #531      +/-   ##
==========================================
- Coverage   80.59%   75.50%   -5.10%     
==========================================
  Files          35       50      +15     
  Lines        6575     4821    -1754     
  Branches      440      630     +190     
==========================================
- Hits         5299     3640    -1659     
+ Misses       1276     1180      -96     
- Partials        0        1       +1     

Flag	Coverage Δ
4.3.5	?
4.6.4	?
4.8.4	74.25% <57.70%> (?)
4.9.5	?
latest	75.25% <57.70%> (-5.02%)	⬇️

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[RebeccaStevens]

@JoshuaKGoldberg I updated a few things. LGTM now

[JoshuaKGoldberg]

Great thanks! I think we should wait on #535 to get these merged in the same time, since #535 is a breaking change too.