Bump aws-actions/configure-aws-credentials from 5 to 6

Bumps [aws-actions/configure-aws-credentials](https://github.com/aws-actions/configure-aws-credentials) from 5 to 6.
- [Release notes](https://github.com/aws-actions/configure-aws-credentials/releases)
- [Changelog](https://github.com/aws-actions/configure-aws-credentials/blob/main/CHANGELOG.md)
- [Commits](aws-actions/configure-aws-credentials@v5...v6)

---
updated-dependencies:
- dependency-name: aws-actions/configure-aws-credentials
  dependency-version: '6'
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

Author: dependabot[bot]

.github/workflows/ci.yml

@@ -156,7 +156,7 @@ jobs:
         username: nextstrain-bot
         password: ${{ secrets.GH_TOKEN_NEXTSTRAIN_BOT_MANAGE_PACKAGES }}
 
-    - uses: aws-actions/configure-aws-credentials@v5
+    - uses: aws-actions/configure-aws-credentials@v6
       with:
         aws-region: us-east-1
         role-to-assume: arn:aws:iam::827581582529:role/GitHubActionsRoleNextstrainTmpBucket