chore(release): hoocloak 2.1.0

[wakemeup0]

Publish Hoocloak 2.1.0 after the successful CI run for main commit 6f871f8.

• Bump the provider and Helm chart versions to 2.1.0.
• Add changelog entries including the default-password behavior from feat(hoocloak): allow default password for users without hash #16.
• Compatibility/security impact: users without password_hash can sign in with the shared password hoo; configured hashes remain authoritative. Operators requiring individual credentials must set hashes for all users.
• Deployment: release artifacts are built and published by the protected release workflow after this PR merges and the release commit passes CI.
• Rollback: deploy the prior image/chart version; configs with omitted hashes must first restore valid hashes for that version.