Bump aws-sdk from 2.573.0 to 2.578.0

Bumps [aws-sdk](https://github.com/aws/aws-sdk-js) from 2.573.0 to 2.578.0.
- [Release notes](https://github.com/aws/aws-sdk-js/releases)
- [Changelog](https://github.com/aws/aws-sdk-js/blob/master/CHANGELOG.md)
- [Commits](https://github.com/aws/aws-sdk-js/compare/v2.573.0...v2.578.0)

Signed-off-by: dependabot-preview[bot] <support@dependabot.com>

package.json

@@ -26,7 +26,7 @@
   "homepage": "https://github.com/aws-actions/configure-aws-credentials#readme",
   "dependencies": {
     "@actions/core": "^1.2.0",
-    "aws-sdk": "^2.573.0"
+    "aws-sdk": "^2.578.0"
   },
   "devDependencies": {
     "@zeit/ncc": "^0.20.5",