fix: Add type annotation to LambdaRequest's Deserialize impl to avoid compiler recursive loop

[raulescobar-g]

I ran into an issue where the compiler would get into an infinite loop evaluating lambda_http/src/deserializer.rs:23. I haven't seen anyone else complaining, so this might just be an issue from my own code.

error[E0275]: overflow evaluating the requirement `Box<_>: Deserialize<'_>`
  --> /home/redacted/.cargo/registry/src/index.crates.io-6f17d22bba15001f/lambda_http-0.13.0/src/deserializer.rs:23:45
   |
23 |         let raw_value: Box<RawValue> = Box::deserialize(deserializer)?;
   |                                             ^^^^^^^^^^^
   |
   = help: consider increasing the recursion limit by adding a `#![recursion_limit = "256"]` attribute to your crate (`lambda_http`)
   = note: required for `Box<zerovec::varzerovec::slice::VarZeroSlice<_, _>>` to implement `Deserialize<'_>`
   = note: 126 redundant requirements hidden
   = note: required for `Box<VarZeroSlice<VarZeroSlice<VarZeroSlice<VarZeroSlice<..., ...>, ...>, ...>, ...>>` to implement `Deserialize<'_>`
   = note: the full name for the type has been written to '/home/redacted/Documents/bernardino-reports/target/debug/deps/lambda_http-09107d4e09e782b6.long-type-5185401784481107607.txt'
   = note: consider using `--verbose` to print the full type name to the console

For more information about this error, try `rustc --explain E0275`.
error: could not compile `lambda_http` (lib) due to 1 previous error

I am not experienced in rust, or oss contributions in general, so apologies in advance if I am not following proper oss ettiquet and any advice/help would be appreciated.

📬 Issue #, if available:
n/a.

✍️ Description of changes:
added a type hint to deserialize implementation of LambdaRequest. This avoids an infinite loop when evaluating a Box::deserialize()

🔏 By submitting this pull request

• I confirm that I've ran cargo +nightly fmt.
• I confirm that I've ran cargo clippy --fix.
• I confirm that I've made a best effort attempt to update all relevant documentation.
• I confirm that my contribution is made under the terms of the Apache 2.0 license.

[raulescobar-g]

I don't know why adding the annotation helped when there's already a type hint on the left hand side. My rustc version is cargo 1.82.0 (8f40fc59f 2024-08-21) if thats relevant.

[fabiandiez]

I can confirm this is happening on rustc 1.85.0 (4d91de4e4 2025-02-17)/lambda_http-0.14.0 as well for me.

[aradwann]

I can confirm that too

I can confirm this is happening on rustc 1.85.0 (4d91de4e4 2025-02-17)/lambda_http-0.14.0 as well for me.

[bnusunny]

This is interesting. I will take a look soon.