Bump version to 2.31.0

.mergify.yml

@@ -150,3 +150,14 @@ pull_request_rules:
         labels:
           - automatic backport
           - merge-queue
+
+  - name: backport patches to 2.30
+    conditions:
+      - label=backport 2.30-maintenance
+    actions:
+      backport:
+        branches:
+          - "2.30-maintenance"
+        labels:
+          - automatic backport
+          - merge-queue

.version

@@ -1 +1 @@
-2.30.0
+2.31.0

maintainers/release-process.md

@@ -39,10 +39,6 @@ release:
 * Proof-read / edit / rearrange the release notes if needed. Breaking changes
   and highlights should go to the top.
 
-* Run `maintainers/release-credits` to make sure the credits script works
-  and produces a sensible output. Some emails might not automatically map to
-  a GitHub handle.
-
 * Push.
 
   ```console