tell renovate to include alpha packages in updates

renovate.json5

@@ -4,6 +4,18 @@
     "config:base"
   ],
   "packageRules": [
+    {
+      "matchPackageNames": [
+        "io.opentelemetry.instrumentation:opentelemetry-instrumentation-bom-alpha",
+        "io.opentelemetry.instrumentation:opentelemetry-instrumentation-api-semconv",
+        "io.opentelemetry.instrumentation:opentelemetry-okhttp-3.0"
+      ],
+      // Renovate's default behavior is only to update from unstable -> unstable if it's for the
+      // major.minor.patch, under the assumption that you would want to update to the stable version
+      // of that release instead of the unstable version for a future release (but there's never any
+      // stable version of opentelemetry-instrumentation-bom-alpha so this logic doesn't apply
+      "ignoreUnstable": false
+    },
     {
       // navigation-fragment 2.7.0 and above require android api 34+, which we are not ready for
       // yet due to android gradle plugin only supporting min 33.