refactor: drop internal/promise v2 support

[xepozz]

What was changed

Drop internal/promise v2 support

test.3.0.txt

All tests in the https://github.com/temporalio/features passed

Tests in https://github.com/temporalio/roadrunner-temporal passed as well

 grep -A 1 '"name": "internal/promise"' tests/php_test_files/composer.lock
            "name": "internal/promise",
            "version": "3.4.1",

❯ CGO_ENABLED=0 go test -timeout 20m -v -race -failfast ./...
?       github.com/temporalio/roadrunner-temporal/v5    [no test files]
?       github.com/temporalio/roadrunner-temporal/v5/aggregatedpool     [no test files]
?       github.com/temporalio/roadrunner-temporal/v5/api        [no test files]
=== RUN   Test_CancellerNoListeners
--- PASS: Test_CancellerNoListeners (0.00s)
=== RUN   Test_CancellerListenerError
--- PASS: Test_CancellerListenerError (0.00s)
=== RUN   Test_CancellerListenerDiscarded
--- PASS: Test_CancellerListenerDiscarded (0.00s)
PASS
ok      github.com/temporalio/roadrunner-temporal/v5/canceller  (cached)
=== RUN   Test_Passthough
--- PASS: Test_Passthough (0.00s)
PASS
ok      github.com/temporalio/roadrunner-temporal/v5/dataconverter      (cached)
?       github.com/temporalio/roadrunner-temporal/v5/internal   [no test files]
?       github.com/temporalio/roadrunner-temporal/v5/internal/codec/proto       [no test files]
?       github.com/temporalio/roadrunner-temporal/v5/internal/logger    [no test files]
=== RUN   Test_MessageQueueFlushError
--- PASS: Test_MessageQueueFlushError (0.00s)
=== RUN   Test_MessageQueueFlushResponse
--- PASS: Test_MessageQueueFlushResponse (0.00s)
=== RUN   Test_MessageQueueCommandID
--- PASS: Test_MessageQueueCommandID (0.00s)
PASS
ok      github.com/temporalio/roadrunner-temporal/v5/queue      (cached)
?       github.com/temporalio/roadrunner-temporal/v5/registry   [no test files]

Why?

Solves #692

Checklist

1. Closes

2. How was this tested:

3. Any docs updates needed?

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Project	Deployment	Review	Updated (UTC)
php	Ready	Preview, Comment	Jan 26, 2026 4:55pm