fix(deps): vitest 4.1.11 (security) + skipLibCheck (#368)

Closes #337.

## What was blocking the security update

The vitest advisory fix (Renovate PR #337, `vitest@4.1.0`) has been
failing CI since it opened. The failure is not in this repo's code:

```
../../node_modules/.pnpm/@vitest+runner@4.1.0/node_modules/@vitest/runner/dist/tasks.d-D2GKpdwQ.d.ts(1407,11):
error TS2430: Interface 'FailureScreenshotArtifactAttachment' incorrectly extends interface 'TestAttachment'.
  Type 'FailureScreenshotArtifactAttachment' is not assignable to type 'TestAttachment' with 'exactOptionalPropertyTypes: true'.
```

`@repobuddy/typescript` enables `exactOptionalPropertyTypes`, and no
config in the chain sets `skipLibCheck`, so `tsc` was type-checking a
dependency's shipped declarations. A dependency we cannot edit therefore
gates our build.

`skipLibCheck: true` is added to the three package tsconfigs. It does
not relax any check on this repo's own sources.

## Changes

- `vitest` and `@vitest/coverage-v8` → `^4.1.11` in all three packages
(advisory fixed in 4.1.0).
- `skipLibCheck: true` in `packages/*/tsconfig.json`.

`pnpm verify` (knip + lint + build + coverage + size, all three
packages) passes locally.

No changeset: dev dependencies and a compiler option — nothing reaches
the published packages.

Author: unional

packages/async-context/package.json

@@ -68,14 +68,14 @@
 		"@repobuddy/typescript": "^2.0.0",
 		"@size-limit/preset-small-lib": "^13.0.0",
 		"@types/setimmediate": "^1.0.2",
-		"@vitest/coverage-v8": "^4.0.8",
+		"@vitest/coverage-v8": "^4.1.11",
 		"assertron": "^11.0.1",
 		"npm-run-all2": "^9.0.0",
 		"repobuddy": "^1.0.2",
 		"rimraf": "^6.0.0",
 		"setimmediate": "^1.0.5",
 		"size-limit": "^13.0.0",
-		"vitest": "^4.0.8"
+		"vitest": "^4.1.11"
 	},
 	"engines": {
 		"node": ">= 14.16"

packages/async-context/tsconfig.json

@@ -1,6 +1,7 @@
 {
 	"extends": "@repobuddy/typescript/tsconfig/monorepo",
 	"compilerOptions": {
+		"skipLibCheck": true,
 		"outDir": "esm",
 		"lib": ["ES2022", "ESNext.Disposable", "DOM"],
 		"rootDir": "ts"

packages/async-fp/package.json

@@ -88,14 +88,14 @@
 	"devDependencies": {
 		"@repobuddy/typescript": "^2.0.0",
 		"@size-limit/preset-small-lib": "^13.0.0",
-		"@vitest/coverage-v8": "^4.0.8",
+		"@vitest/coverage-v8": "^4.1.11",
 		"assertron": "^11.0.1",
 		"npm-run-all2": "^9.0.0",
 		"repobuddy": "^1.0.2",
 		"rimraf": "^6.0.0",
 		"size-limit": "^13.0.0",
 		"type-plus": "8.0.0-beta.8",
-		"vitest": "^4.0.8"
+		"vitest": "^4.1.11"
 	},
 	"engines": {
 		"node": ">= 14.16"

packages/async-fp/tsconfig.json

@@ -1,6 +1,7 @@
 {
 	"extends": "@repobuddy/typescript/tsconfig/monorepo",
 	"compilerOptions": {
+		"skipLibCheck": true,
 		"outDir": "esm",
 		"lib": ["ES2022", "ESNext.Disposable", "DOM"],
 		"rootDir": "ts"

packages/gizmo/package.json

@@ -79,13 +79,13 @@
 	"devDependencies": {
 		"@repobuddy/typescript": "^2.0.0",
 		"@size-limit/preset-small-lib": "^13.0.0",
-		"@vitest/coverage-v8": "^4.0.8",
+		"@vitest/coverage-v8": "^4.1.11",
 		"assertron": "^11.0.1",
 		"npm-run-all2": "^9.0.0",
 		"repobuddy": "^1.0.2",
 		"rimraf": "^6.0.0",
 		"size-limit": "^13.0.0",
-		"vitest": "^4.0.8"
+		"vitest": "^4.1.11"
 	},
 	"engines": {
 		"node": ">= 14.16"

packages/gizmo/tsconfig.json

@@ -1,6 +1,7 @@
 {
 	"extends": "@repobuddy/typescript/tsconfig/monorepo",
 	"compilerOptions": {
+		"skipLibCheck": true,
 		"target": "es2022",
 		"lib": ["ES2022", "ESNext.Disposable", "DOM"],
 		"outDir": "esm",