CI fix: pin url for msrv build

[lalitb]

Attempt to fix the CI build issue arising from new published url version
servo/rust-url#992

    Checking idna v1.0.3
error[E0658]: use of unstable library feature 'error_in_core'
  --> /home/runner/.cargo/registry/src/index.crates.io-6f17d22bba15001f/idna-1.0.3/src/lib.rs:78:6
   |
78 | impl core::error::Error for Errors {}
   |      ^^^^^^^^^^^^^^^^^^
   |
   = note: see issue #103765 <https://github.com/rust-lang/rust/issues/103765> for more information

For more information about this error, try `rustc --explain E0658`.

[lalitb]

Oh, it's not just the msrv failure, the CI will fail for opentelemetry-sdk too for rustc 1.70.0 and jaeger_remote_sampler feature :

labhas@DESKTOP-KNU1IS8:~/obs/ot/lalit/rust/opentelemetry-rust/opentelemetry-sdk$ cargo build --features="jaeger_remote_sampler"
   Compiling smallvec v1.13.2
   Compiling serde v1.0.214
   Compiling form_urlencoded v1.2.1
   Compiling futures-util v0.3.31
   Compiling rand_chacha v0.3.1
   Compiling opentelemetry-http v0.26.0 (/home/labhas/obs/ot/lalit/rust/opentelemetry-rust/opentelemetry-http)
   Compiling icu_normalizer v1.5.0
   Compiling rand v0.8.5
   Compiling idna_adapter v1.2.0
   Compiling idna v1.0.3
error[E0658]: use of unstable library feature 'error_in_core'
  --> /home/labhas/.cargo/registry/src/index.crates.io-6f17d22bba15001f/idna-1.0.3/src/lib.rs:78:6
   |
78 | impl core::error::Error for Errors {}
   |      ^^^^^^^^^^^^^^^^^^
   |
   = note: see issue #103765 <https://github.com/rust-lang/rust/issues/103765> for more information

For more information about this error, try `rustc --explain E0658`.
error: could not compile `idna` (lib) due to previous error
warning: build failed, waiting for other jobs to finish...

better to pin the Cargo.toml

[lalitb]

better to pin the Cargo.toml

done.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 79.4%. Comparing base (6a079eb) to head (f48cba9).

Additional details and impacted files

@@          Coverage Diff          @@
##            main   #2272   +/-   ##
=====================================
  Coverage   79.4%   79.4%           
=====================================
  Files        121     121           
  Lines      20981   20981           
=====================================
  Hits       16673   16673           
  Misses      4308    4308           

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