Fix `IncompatibleReturnValueException` in `MessageFactoryTest`

[Nevay]

PSR7 RequestInterface::getUri() must return UriInterface, not string; explicit typehint was added in 2.0.

See https://github.com/open-telemetry/opentelemetry-php/actions/runs/11087368795/job/30806007374?pr=1391#step:17:50.

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 73.71%. Comparing base (20bf3cf) to head (e603522). Report is 1 commits behind head on main.

Additional details and impacted files

[](https://app.codecov.io/gh/open-telemetry/opentelemetry-php/pull/1392?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=open-telemetry) ```diff @@ Coverage Diff @@ ## main #1392 +/- ## ============================================ + Coverage 73.56% 73.71% +0.14% Complexity 2672 2672 ============================================ Files 386 386 Lines 7650 7650 ============================================ + Hits 5628 5639 +11 + Misses 2022 2011 -11 ``` | [Flag](https://app.codecov.io/gh/open-telemetry/opentelemetry-php/pull/1392/flags?src=pr&el=flags&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=open-telemetry) | Coverage Δ | | |---|---|---| | [8.1](https://app.codecov.io/gh/open-telemetry/opentelemetry-php/pull/1392/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=open-telemetry) | `73.42% <ø> (?)` | | | [8.2](https://app.codecov.io/gh/open-telemetry/opentelemetry-php/pull/1392/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=open-telemetry) | `73.67% <ø> (?)` | | | [8.3](https://app.codecov.io/gh/open-telemetry/opentelemetry-php/pull/1392/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=open-telemetry) | `73.67% <ø> (?)` | | | [8.4](https://app.codecov.io/gh/open-telemetry/opentelemetry-php/pull/1392/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=open-telemetry) | `73.67% <ø> (+0.11%)` | :arrow_up: | Flags with carried forward coverage won't be shown. [Click here](https://docs.codecov.io/docs/carryforward-flags?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=open-telemetry#carryforward-flags-in-the-pull-request-comment) to find out more. [see 5 files with indirect coverage changes](https://app.codecov.io/gh/open-telemetry/opentelemetry-php/pull/1392/indirect-changes?src=pr&el=tree-more&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=open-telemetry) ------ [Continue to review full report in Codecov by Sentry](https://app.codecov.io/gh/open-telemetry/opentelemetry-php/pull/1392?dropdown=coverage&src=pr&el=continue&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=open-telemetry). > **Legend** - [Click here to learn more](https://docs.codecov.io/docs/codecov-delta?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=open-telemetry) > `Δ = absolute (impact)`, `ø = not affected`, `? = missing data` > Powered by [Codecov](https://app.codecov.io/gh/open-telemetry/opentelemetry-php/pull/1392?dropdown=coverage&src=pr&el=footer&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=open-telemetry). Last update [20bf3cf...e603522](https://app.codecov.io/gh/open-telemetry/opentelemetry-php/pull/1392?dropdown=coverage&src=pr&el=lastupdated&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=open-telemetry). Read the [comment docs](https://docs.codecov.io/docs/pull-request-comments?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=open-telemetry).