Add missing default value for aggregation-temporality property

Closes gh-41674

Author: snicoll

spring-boot-project/spring-boot-actuator-autoconfigure/src/main/resources/META-INF/additional-spring-configuration-metadata.json

@@ -2083,6 +2083,10 @@
       "description": "Whether auto-configuration of Micrometer annotations is enabled.",
       "defaultValue": false
     },
+    {
+      "name": "management.otlp.metrics.export.aggregation-temporality",
+      "defaultValue": "cumulative"
+    },
     {
       "name": "management.otlp.metrics.export.base-time-unit",
       "defaultValue": "milliseconds"