Ignore release.yml in Renovate config (#17746)

## Summary

`release.yml` is managed by dist, so Renovate creates a lot of
chaff/noise/unnecessary dirty changes when trying to bump it. See #17302
for example.

## Test Plan

NFC.

---------

Signed-off-by: William Woodruff <william@astral.sh>

.github/renovate.json5

@@ -39,6 +39,13 @@
       matchManagers: ["cargo"],
       enabled: false,
     },
+    {
+      // Disable updates of actions used by `.github/workflows/release.yml`;
+      // these action pins are managed by dist-workspace.toml
+      matchFileNames: [".github/workflows/release.yml"],
+      matchManagers: ["github-actions"],
+      enabled: false,
+    },
     {
       // Create dedicated branches to update references to dependencies in the documentation.
       matchFileNames: ["docs/**/*.md"],