RFR: 8317374: Add Let's Encrypt ISRG Root X2

[Sean Mullan]

On Wed, 1 Nov 2023 16:10:23 GMT, Rajan Halade <rhalade at openjdk.org> wrote:

> This PR is to add new TLS root certificates from Let's Encrypt. This CA has gone through https://www.oracle.com/java/technologies/javase/carootcertsprogram.html process.
> 
> 
> The release-note is at [JDK-8318618](https://bugs.openjdk.org/browse/JDK-8318618)

Marked as reviewed by mullan (Reviewer).

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PR Review: https://git.openjdk.org/jdk/pull/16455#pullrequestreview-1710144171