Bump octodns/cloudflare in /.github/actions/octodns-cloudflare

Bumps octodns/cloudflare from 2025.07 to 2025.08.

---
updated-dependencies:
- dependency-name: octodns/cloudflare
  dependency-version: '2025.08'
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

.github/actions/octodns-cloudflare/Dockerfile

@@ -1 +1 @@
-FROM octodns/cloudflare:2025.07
+FROM octodns/cloudflare:2025.08