Add Renovate automation for maturin version bumps (#17353)

Co-authored-by: Claude <noreply@anthropic.com>

.github/renovate.json5

@@ -106,6 +106,11 @@
       matchDepNames: ["rust"],
       commitMessageTopic: "Rust",
     },
+    {
+      matchManagers: ["custom.regex"],
+      matchDepNames: ["maturin"],
+      commitMessageTopic: "maturin",
+    },
   ],
   customManagers: [
     // Update major GitHub actions references in documentation.
@@ -118,6 +123,15 @@
       datasourceTemplate: "github-tags",
       versioningTemplate: "regex:^v(?<major>\\d+)$",
     },
+    // Maturin version used in maturin-action
+    {
+      customType: "regex",
+      managerFilePatterns: ["/.github/workflows/build-binaries\\.yml$/"],
+      matchStrings: ["maturin-version: (?<currentValue>v\\d+\\.\\d+\\.\\d+)"],
+      depNameTemplate: "maturin",
+      packageNameTemplate: "PyO3/maturin",
+      datasourceTemplate: "github-releases",
+    },
     // Minimum supported Rust toolchain version
     {
       customType: "regex",