Upgrade to Coroutines 1.4.0-M1 and use awaitSingle()

This commit raises the minimum Coroutines version supported
to 1.4.0-M1 and above, and changes usages of awaitFirst() or
awaitFirstOrNull() to awaitSingle() or awaitSingleOrNull()
to fix gh-25007.

Closes gh-25914
Closes gh-25007

src/docs/asciidoc/data-access.adoc

@@ -6749,7 +6749,7 @@ The following query gets the `id` and `name` columns from a table:
 .Kotlin
 ----
 	val first = client.sql("SELECT id, name FROM person")
-	        .fetch().awaitFirst()
+	        .fetch().awaitSingle()
 ----
 
 The following query uses a bind variable:
@@ -6766,7 +6766,7 @@ The following query uses a bind variable:
 ----
 	val first = client.sql("SELECT id, name FROM person WHERE WHERE first_name = :fn")
 	        .bind("fn", "Joe")
-	        .fetch().awaitFirst()
+	        .fetch().awaitSingle()
 ----
 
 You might have noticed the use of `fetch()` in the example above. `fetch()` is a
@@ -6776,7 +6776,7 @@ Calling `first()` returns the first row from the result and discards remaining r
 You can consume data with the following operators:
 
 * `first()` return the first row of the entire result. Its Kotlin Coroutine variant
-is named `awaitFirst()` for non-nullable return values and `awaitFirstOrNull()`
+is named `awaitSingle()` for non-nullable return values and `awaitSingleOrNull()`
 if the value is optional.
 * `one()` returns exactly one result and fails if the result contains more rows.
 Using Kotlin Coroutines, `awaitOne()` for exactly one value or `awaitOneOrNull()`

src/docs/asciidoc/languages/kotlin.adoc

@@ -434,7 +434,7 @@ dependencies {
 }
 ----
 
-Version `1.3.9` and above are supported.
+Version `1.4.0-M1` and above are supported.
 
 === How Reactive translates to Coroutines?
 

src/docs/asciidoc/rsocket.adoc

@@ -601,7 +601,7 @@ Then start an RSocket server through the Java RSocket API and plug the
 
 	val server = RSocketServer.create(handler.responder())
 			.bind(TcpServerTransport.create("localhost", 7000))
-			.awaitFirst()
+			.awaitSingle()
 ----
 
 `RSocketMessageHandler` supports

src/docs/asciidoc/web/webflux-functional.adoc

@@ -172,7 +172,7 @@ Flux<Person> people = request.body(BodyExtractors.toFlux(Person.class));
 [source,kotlin,role="secondary"]
 .Kotlin
 ----
-	val string = request.body(BodyExtractors.toMono(String::class.java)).awaitFirst()
+	val string = request.body(BodyExtractors.toMono(String::class.java)).awaitSingle()
 	val people = request.body(BodyExtractors.toFlux(Person::class.java)).asFlow()
 ----