Merge pull request #14693 from clareliguori/upgrade-techdocs-sdk-v3

TechDocs: upgrade to AWS SDK v3

.changeset/slow-flies-marinate.md

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+---
+'@backstage/plugin-events-backend-module-aws-sqs': patch
+---
+
+Upgrade to AWS SDK for Javascript v3

.changeset/slow-flies-marry.md

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+---
+'@backstage/plugin-techdocs-node': patch
+---
+
+Upgrade to AWS SDK for Javascript v3
+
+Techdocs support for AWS S3 now requires defining the AWS region to connect to.
+If `techdocs.publisher.awsS3.region` is missing from the config, the AWS environment variable `AWS_REGION` will be used.