Update django-s3sign requirement from <=0.2.1 to <=0.6.4

[dependabot]

Updates the requirements on django-s3sign to permit the latest version.

Release notes

Sourced from django-s3sign's releases.

0.6.4

• Don't use class export in s3upload.js

Changelog

Sourced from django-s3sign's changelog.

0.6.4 (2026-03-31)

• Don't use class export in s3upload.js

0.6.3 (2026-02-20)

• Use default extension when no mime type is present

0.6.2 (2026-02-06)

• Recognize more audio mime types

0.6.1 (2026-01-15)

• Use modern JS class for S3Upload
• Add webm file format

0.6.0 (2026-01-12)

• Removed deprecated acl functionality
• Added eslint checking

0.5.1 (2024-01-15)

• Revised upload methods

0.5.0 (2025-01-13)

• Refactored upload logic out of view code
• Added .avif image format.
• Clean up SignS3View method signatures
• Use timezone-aware datetime object in SignS3View

0.4.1 (2025-01-10)

• Recognize heic and heif MIME types.

0.4.0 (2023-09-21)

• Adjust S3Upload.file_dom_selector to allow for any DOM selector rather than just an ID.
• Introduced new optional param file_dom_el for passing in the file input element directly. This is convenient when initializing S3Upload from an event, as you can just pass in the event.target object.

0.3.3 (2023-03-03)

• Fixed bug where acl attribute was not working, preventing the ability to upload objects with public-read access.

... (truncated)

Commits

• de0b120 Merge pull request #444 from ccnmtl/release-0.6.4
• 5e75b5c 🔖 release version 0.6.4
• 8da9612 Merge pull request #443 from ccnmtl/fix-class-export
• 1d9d240 Merge pull request #442 from ccnmtl/dependabot/pip/faker-40.12.0
• 3a70322 Don't export class in s3upload.js
• a0f155e ⬆️ Bump faker from 40.11.1 to 40.12.0
• 3afc704 Merge pull request #441 from ccnmtl/dependabot/pip/faker-40.11.1
• 65cb2fb ⬆️ Bump faker from 40.11.0 to 40.11.1
• b7109c6 Merge pull request #439 from ccnmtl/dependabot/pip/importlib-metadata-9.0.0
• 59d6764 Merge pull request #440 from ccnmtl/dependabot/npm_and_yarn/flatted-3.4.2
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