fix msrv

[lalitb]

Fixes #1874
Design discussion issue (if applicable) #

Changes

The opentelemetry-http has an indirect dependency on the url crate via reqwest. Pinning the url crate to a version that supports Rust 1.65.0.

Merge requirement checklist

• CONTRIBUTING guidelines followed
• Unit tests added/updated (if applicable)
• Appropriate CHANGELOG.md files updated for non-trivial, user-facing changes
• Changes in public API reviewed (if applicable)

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 74.6%. Comparing base (b933bdd) to head (4685646).

Additional details and impacted files

@@          Coverage Diff          @@
##            main   #1877   +/-   ##
=====================================
  Coverage   74.6%   74.6%           
=====================================
  Files        122     122           
  Lines      19952   19952           
=====================================
  Hits       14902   14902           
  Misses      5050    5050           

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[cijothomas]

changelog ?

[lalitb]

changelog ?

do we need it, as it won't affect customers. They can still continue using their own version of url crate for their application usage.

[ThomsonTan]

Why need ping this version to support the given rustc?

[lalitb]

If not pinned, the latest version 2.5.1 will be used, which requires rust 1.67.
Another option would be to bump to msrv 1.67, but as we can still support 1.65 with minimal changes, so prefer the pinning.

[cijothomas]

changelog ?

do we need it, as it won't affect customers. They can still continue using their own version of url crate for their application usage.

there is bump from 2.2 to 2.5.1 right?

[lalitb]

there is bump from 2.2 to 2.5.1 right?

Not actually. With URL "=2.5.0", we are ensuring that the reqwest crate in otel-http doesn't use url crate version beyond "2.5.0". Customers needn't be interested to know as long as it doesn't affect their usage of otel crates with the currently supported rust version. And this doesn't anyway affect the direct usage of these crates (reqwest, url) in customer's application.