fix: fixes salesforce connector errors

[a-rampalli]

What

1. Changed date format in latest image blocking source creation.
2. Some resources sync failing.
   Issues detailed in comments here (https://linear.app/rudderstack/issue/ETL-55/salesforce-image-update)

[linear]

ETL-55 Salesforce image update

Update current salesforce v4.0.5 image to v8.1.0

[github-actions]

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[nidhilashkari17]

@a-rampalli will this impact existing connections ?

[a-rampalli]

Checked backward compatibility. No issues with syncs

[a-rampalli]

Will show an error in configuration screen for existing sources but syncs work fine. This can be fixed if user selects start date again (Will be stored in the new format in db now). Didn't add as a step for customer as it is not strictly necessary