Release 0.5.0

Full Changelog: v0.4.0...v0.5.0

• Merge pull request #391 from markcallen/feat/aws-secret-management-383
• fix(upsert): harden source parsing and failure handling
• feat(aws): add secret append/remove and align file upsert docs
• docs: clarify injection usage requires command or file output
• feat(aws): upsert secrets from env file with import alias
• docs: clarify aws injection vs secret management usage
• Bump the aws-sdk group with 3 updates (#389)