Backport of sdk/ldap: update interface to use DialURL into release/1.13.x

[hc-github-team-secure-vault-core]

Backport

This PR is auto-generated from #20200 to be assessed for backporting due to the inclusion of the label backport/1.13.x.

WARNING automatic cherry-pick of commits failed. Commits will require human attention.

merge conflict error: POST https://api.github.com/repos/hashicorp/vault/merges: 409 Merge conflict []

The below text is copied from the body of the original PR.

---

I recently merged #20144 which adds connection timeout configuration, however, this was causing race tests to fail since it was changing a package variable. To fix this, I've changed the LDAP interface to use the suggested ldap.DialURL function instead of the deprecated ldap.Dial and ldap.DialTLS functions.

---

Overview of commits

• d5584b6

[hashicorp-cla]

Thank you for your submission! We require that all contributors sign our Contributor License Agreement ("CLA") before we can accept the contribution. Read and sign the agreement

Learn more about why HashiCorp requires a CLA and what the CLA includes

---

1 out of 2 committers have signed the CLA.

• jasonodonnell
• temp

---

temp seems not to be a GitHub user.
You need a GitHub account to be able to sign the CLA. If you already have a GitHub account, please add the email address used for this commit to your account.

_{Have you signed the CLA already but the status is still pending? Recheck it.}