Stop pinning idna and url crates

[ysaito1001]

Motivation and Context

Now that we're on MSRV 1.8.1 we can addresses these TODOs.

Testing

Manually ran

./gradlew aws:sdk:cargoUpdateAllLockfiles 

and bulit aws-sdk-s3 (can be any SDK crate) with updated idna and url crates:

➜  s3 git:(ysaito/remove-pinning-idna-and-url) ✗ cargo check --all-features
...
    Checking idna v1.0.3
...
    Checking url v2.5.4
...
    Finished `dev` profile [unoptimized + debuginfo] target(s) in 15.56s

I didn't include updated lockfiles in this PR as they will be updated automatically next week by the bot's weekly PR to update lockfiles.

---

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[github-actions]

A new generated diff is ready to view.

• No codegen difference in the AWS SDK
• No codegen difference in the Client Test
• No codegen difference in the Server Test
• No codegen difference in the Server Test Python
• No codegen difference in the Server Test Typescript

A new doc preview is ready to view.

[landonxjames]

Weirdly I had that TLS failure on my PR as well. First time I have seen that, but otherwise LGTM

[ysaito1001]

Weirdly I had that TLS failure on my PR as well. First time I have seen that, but otherwise LGTM

Yeah, this looks like an across-the-board failure and related to BradenM/micropy-cli#575