MongoDB Atlas Client Release v0.26.0

What's Changed

• Revert "CLOUDP-169104: Fix encoding for AWS IAM usernames (#452)" by @matt-condon in #465
• test: update actions to use the new go action values by @gssbzn in #468
• task: lower stale action permissions by @gssbzn in #469
• INTMDB-801: Add Data Federation to the go client by @andreaangiolillo in #472
• INTMDB-813: 0.26.0 pre-release by @maastha in #474

Full Changelog: v0.25.0...v0.26.0