docs: Update release 1.30 dates

[adisuissa]

Commit Message: docs: Update release 1.30 dates Additional Description: Updating the RELEASES.md file with the v1.30.0 release dates.

Risk Level: low Testing: N/A Docs Changes: N/A Release Notes: N/A Platform Specific Features: N/A

[repokitteh-read-only[bot]]

Docs for this Pull Request will be rendered here:

https://storage.googleapis.com/envoy-pr/34290/docs/index.html

The docs are (re-)rendered each time the CI envoy-presubmit (precheck docs) job completes.

:cat:

Caused by: https://github.com/envoyproxy/envoy/pull/34290 was opened by adisuissa.

see: more, trace.

[adisuissa]

It seems I forgot to do this as part of the last release. /assign @phlax