update all APIs

Like documented in the README

```
rm -f .api.deps .cli.deps && FETCH_APIS=1 make update-json -j8
```

etc/api/pubsub/v1beta1a/pubsub-api.json

@@ -18,6 +18,23 @@
     "description": "Provides reliable, many-to-many, asynchronous messaging between applications. ",
     "discoveryVersion": "v1",
     "documentationLink": "https://cloud.google.com/pubsub/docs",
+    "endpoints": [
+        {
+            "description": "Regional Endpoint",
+            "endpointUrl": "https://pubsub.me-central2.rep.googleapis.com/",
+            "location": "me-central2"
+        },
+        {
+            "description": "Regional Endpoint",
+            "endpointUrl": "https://pubsub.europe-west3.rep.googleapis.com/",
+            "location": "europe-west3"
+        },
+        {
+            "description": "Regional Endpoint",
+            "endpointUrl": "https://pubsub.europe-west9.rep.googleapis.com/",
+            "location": "europe-west9"
+        }
+    ],
     "icons": {
         "x16": "http://www.google.com/images/icons/product/search-16.gif",
         "x32": "http://www.google.com/images/icons/product/search-32.gif"
@@ -457,7 +474,7 @@
             }
         }
     },
-    "revision": "20230119",
+    "revision": "20240227",
     "rootUrl": "https://pubsub.googleapis.com/",
     "schemas": {
         "AcknowledgeRequest": {
@@ -550,6 +567,7 @@
                     "type": "integer"
                 },
                 "ackId": {
+                    "deprecated": true,
                     "description": "The acknowledgment ID. Either this or ack_ids must be populated, not both.",
                     "type": "string"
                 },