Bump shogo82148/rdsmysql/v2 v2.4.0 to v2.5.0

[kc9wwh]

shogo82148/rdsmysql#222

Adds AWS GovCloud RDS CA certificates (us-gov-east-1, us-gov-west-1) to the rdsmysql TLS bundle, improving compatibility for Fleet deployments in AWS GovCloud regions.

Transitive dependency updates pulled in by rdsmysql v2.5.0:

• github.com/aws/aws-sdk-go-v2 and related submodules (minor bumps)
• github.com/go-sql-driver/mysql v1.9.1 -> v1.9.3
• filippo.io/edwards25519 v1.1.0 -> v1.1.1

Related issue: Resolves #40148

Checklist for submitter

• Changes file added for user-visible changes in changes/, orbit/changes/ or ee/fleetd-chrome/changes.

Testing

• QA'd all new/changed functionality manually
  — dependency bump only; ran full local test suite across all affected packages (server/platform/mysql, server/logging, server/config, server/mail) with no regressions. go mod verify passed.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 66.28%. Comparing base (357c42c) to head (ab86ed5).
⚠️ Report is 45 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main   #40103   +/-   ##
=======================================
  Coverage   66.28%   66.28%           
=======================================
  Files        2445     2445           
  Lines      195899   195899           
  Branches     8676     8676           
=======================================
+ Hits       129847   129853    +6     
+ Misses      54291    54288    -3     
+ Partials    11761    11758    -3     

Flag	Coverage Δ
backend	68.08% <ø> (+<0.01%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.
• 📦 JS Bundle Analysis: Save yourself from yourself by tracking and limiting bundle sizes in JS merges.

[rachaelshaw]

@kc9wwh Created an issue to track this: #40148. Converting to a draft until we get it scheduled into a sprint for review/QA.

[iansltx]

@rachaelshaw This is just a deps update for a minor release of a dep, so all we need to do is QA the new functionality FWIW. Approving this now as it's a low risk change.