fix: update remaining codecov-action references from v3 to v4

Author: JoshuaKGoldberg

script/__snapshots__/migrate-test-e2e.js.snap

@@ -53,7 +53,7 @@ exports[`expected file changes > .github/workflows/test.yml 1`] = `
 @@ ... @@ jobs:
        - run: pnpm run test --coverage
        - name: Codecov
-         uses: codecov/codecov-action@v3
+         uses: codecov/codecov-action@v4
 -        with:
 -          flags: unit
  

src/steps/writing/creation/dotGitHub/createWorkflows.test.ts

@@ -314,7 +314,7 @@ describe("createWorkflows", () => {
 			      - uses: ./.github/actions/prepare
 			      - run: pnpm run test --coverage
 			      - name: Codecov
-			        uses: codecov/codecov-action@v3
+			        uses: codecov/codecov-action@v4
 
 			name: Test
 

src/steps/writing/creation/dotGitHub/createWorkflows.ts

@@ -218,7 +218,7 @@ export function createWorkflows(options: Options) {
 					{ run: "pnpm run test --coverage" },
 					{
 						name: "Codecov",
-						uses: "codecov/codecov-action@v3",
+						uses: "codecov/codecov-action@v4",
 					},
 				],
 			}),