fix(actions): keep github.event.inputs as strings for workflow_dispatch (#38899)

`github.event.inputs` must mirror the raw `workflow_dispatch` payload,
where
GitHub keeps every input as a string. Only the separate `inputs` context
preserves declared types, e.g. booleans. A previous fix coerced boolean
inputs in the single map that fed both contexts, so
`github.event.inputs.someBool` became a real boolean and comparisons
like
`== 'true'` stopped matching.

`github.event.inputs` now stays string-only again. The `inputs` context
used
for server-side `if:` evaluation of needs-gated/matrix-deferred jobs
re-coerces booleans independently, from the job's own workflow
declaration,
so that path keeps working correctly.

Fixes https://github.com/go-gitea/gitea/issues/38896

---------

Co-authored-by: Zettat123 <zettat123@gmail.com>
Co-authored-by: silverwind <me@silverwind.io>

services/actions/context_test.go

@@ -37,12 +37,13 @@ func TestEvaluateRunConcurrency_RunIDFallback(t *testing.T) {
 
 	expr := &act_model.RawConcurrency{
 		Group:            "${{ github.workflow }}-${{ github.head_ref || github.run_id }}",
-		CancelInProgress: "true",
+		CancelInProgress: "True",
 	}
 
 	assert.NoError(t, EvaluateRunConcurrencyFillModel(ctx, runA, attemptA, expr, nil, nil))
 	assert.NoError(t, EvaluateRunConcurrencyFillModel(ctx, runB, attemptB, expr, nil, nil))
 
+	assert.True(t, attemptA.ConcurrencyCancel)
 	assert.Contains(t, attemptA.ConcurrencyGroup, "791")
 	assert.Contains(t, attemptB.ConcurrencyGroup, "792")
 	assert.NotEqual(t, attemptA.ConcurrencyGroup, attemptB.ConcurrencyGroup)