Name the engine in the provisions these tests declare

Follows novox/hq ADR 0027: a consumer is written against PostgreSQL,
not against a database.

test/integration/provisioner.test.ts

@@ -75,7 +75,7 @@ async function meshWrote(
 ): Promise<void> {
   const manifest = {
     contributions: 1,
-    requirement: "database",
+    requirement: "postgres-database",
     generated: "by the mesh",
     given: consumers.map((c) => ({
       from: c.module,
@@ -247,7 +247,7 @@ test("a manifest naming a credential that was never written is refused", { skip,
   // report until something tried to connect.
   await meshWrote([]);
   await must(
-    `printf %s '{"contributions":1,"requirement":"database","given":[` +
+    `printf %s '{"contributions":1,"requirement":"postgres-database","given":[` +
       `{"from":"meshboard","node":"ghost","secret":"${GRANTS}/ghost.secret","values":{"name":"ghost"}}` +
       `]}' > ${GRANTS}/mesh.json`,
   );