bump etcd client to v3.5.13

[tsaarni]

This change updates to latest etcd client version. It allows TLSv1.3 to be used between Vault and etcd.

Fixes #26659

[tsaarni]

@hsimon-hashicorp @stevendpclark :wave: Just a gentle nudge :smile:

I just wanted to follow up on this PR and check if you had a chance to consider its inclusion, as it would fix a TLS 1.3 issue for users.

[VioletHynes]

@tsaarni it looks like there are merge conflicts with main -- sorry for jumping the gun with my last comment. If you could get them fixed and tag me when it's ready to merge again, I can hit the merge button if everything looks good.

Sorry this one took a little bit to get some eyes on :)

[tsaarni]

Thank You @VioletHynes for the review! Now again ready for merge :)