fix(NODE-5042): relax SRV record validation to account for a dot suffix

[nbbeeken]

Description

What is changing?

Allows for SRV record addresses to have a trailing dot

Verified manually that this makes deno connect successfully with an SRV record.

To reproduce my success: 😎

• deno init
• Add a package.json with mongodb as a dependency
• import { MongoClient } from 'mongodb'
• deno run --inspect-brk --allow-read --allow-sys --allow-env --allow-net main.ts
• I npm pack-ed this branch and replaced the folder here: node_modules/.deno/mongodb@5.2.0/node_modules/mongodb
• use the deno run command again above and successfully connect to Atlas

What is the motivation for this change?

A trailing dot on a hostname does not prevent dns.lookup resolution so our validation can be made more lenient.

Double check the following

• Ran npm run check:lint script
• Self-review completed using the steps outlined here
• PR title follows the correct format: type(NODE-xxxx)[!]: description
  • Example: feat(NODE-1234)!: rewriting everything in coffeescript
• Changes are covered by tests
• New TODOs have a related JIRA ticket

[addaleax]

Just hitting the red X because of the comment above, feel free to dismiss

addressed