Bump patch version of lambda-http (#556)

This commit updates the version of `lambda-http` to 0.7.1. The crate now
depends on `aws-lambda-events` 0.7.2 or higher whereas it previously
depended on that of ^0.7. This crate currently does not compile against
`aws-lambda-events` 0.7.0 or 0.7.1. In `aws-lambda-events` 0.7.0, the module
`query_map` is private when it should be public for `lambda-http` to compile.
Similarly, in `aws-lambda-events` 0.7.1, the trait bound `QueryMap: FromStr`
is not satisfied so `lambda-http` does not compile either.

Co-authored-by: Saito <awsaito@c889f3b5ddc4.ant.amazon.com>

lambda-http/Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "lambda_http"
-version = "0.7.0"
+version = "0.7.1"
 authors = [
     "David Calavera <dcalaver@amazon.com>",
     "Harold Sun <sunhua@amazon.com>"
@@ -38,7 +38,7 @@ url = "2.2.2"
 percent-encoding = "2.2.0"
 
 [dependencies.aws_lambda_events]
-version = "^0.7"
+version = "^0.7.2"
 default-features = false
 features = ["alb", "apigw"]