[9.4](backport #50477) x-pack/filebeat/input/salesforce: bump go-sfdc for session auth refresh

[mergify]

Proposed commit message

Update the Salesforce input to consume the upstream go-sfdc session refresh fix so auth expiry can recover with the newer client behavior.

This lands the dependency bump separately so salesforce-batching-hardening can merge on top of a stable client baseline.

Checklist

• My code follows the style guidelines of this project
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• I have made corresponding change to the default configuration files
• I have added tests that prove my fix is effective or that my feature works. Where relevant, I have used the stresstest.sh script to run them under stress conditions and race detector to verify their stability.
• I have added an entry in ./changelog/fragments using the changelog tool.

Disruptive User Impact

None expected. This PR only updates the Salesforce client dependency used by the Filebeat Salesforce input.

How to test this PR locally

go test -count=1 ./x-pack/filebeat/input/salesforce/...

Related issues

• Requires Session HTTP client: refresh once on Salesforce auth expiry go-sfdc#5

Use cases

This update lets the Filebeat Salesforce input consume the upstream session handling fix so the client can refresh after Salesforce auth expiry.

Screenshots

N/A

Logs

Verified locally with:

go test -count=1 ./x-pack/filebeat/input/salesforce/...
```<hr>This is an automatic backport of pull request #50477 done by [Mergify](https://mergify.com).

[github-actions]

🤖 GitHub comments

Just comment with:

• run docs-build : Re-trigger the docs validation. (use unformatted text in the comment!)
• /test : Run the Buildkite pipeline.