STRIPES-924 use valid upload-artifact version

Hahaha don't do anything related to STRIPES-924, which is The Right Way
to fix this problem, but instead just work around it by bumping the
version of the deprecated dep, because that's a smaller/safer operation
on a Friday afternoon.

Doesn't actually ref STRIPES-924, just pokes it in the eye

.github/workflows/build-npm-release.yml

@@ -150,15 +150,15 @@ jobs:
           comment_title: Jest Unit Test Statistics
 
       - name: Publish Jest coverage report
-        uses: actions/upload-artifact@v2
+        uses: actions/upload-artifact@v4
         if: always()
         with:
           name: jest-coverage-report
           path: ${{ env.JEST_COVERAGE_REPORT_DIR }}
           retention-days: 30
 
       - name: Publish yarn.lock
-        uses: actions/upload-artifact@v2
+        uses: actions/upload-artifact@v4
         if: failure()
         with:
           name: yarn.lock

.github/workflows/build-npm.yml

@@ -93,15 +93,15 @@ jobs:
           comment_title: Jest Unit Test Statistics
 
       - name: Publish Jest coverage report
-        uses: actions/upload-artifact@v2
+        uses: actions/upload-artifact@v4
         if: always()
         with:
           name: jest-coverage-report
           path: ${{ env.JEST_COVERAGE_REPORT_DIR }}
           retention-days: 30
 
       - name: Publish yarn.lock
-        uses: actions/upload-artifact@v2
+        uses: actions/upload-artifact@v4
         if: failure()
         with:
           name: yarn.lock