replaced new occurences of 'Request::create()' with '::create()'
merged branch jfsimon/issue-7185-2.2 (PR #7390)

This PR was merged into the 2.2 branch.

Commits
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53cf12b replaced new occurences of 'Request::create()' with '::create()'

Discussion
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[2.2] sub-requests are now created with the same class as their parent

Following #7381

| Q             | A
| ------------- | ---
| Bug fix?      | yes
| New feature?  | no
| BC breaks?    | no
| Deprecations? | no
| Tests pass?   | yes
| Fixed tickets | #7185, #7186