Issue:
Bug: chore: address Rust 1.88.0 clippy lints



Address the clippy lints occurring due to new rust version 1.88.0

See https://github.com/juspay/hyperswitch/issues/3391 for more information.

Pull request description:
## Type of Change
<!-- Put an `x` in the boxes that apply -->

- [ ] Bugfix
- [ ] New feature
- [ ] Enhancement
- [x] Refactoring
- [ ] Dependency updates
- [ ] Documentation
- [ ] CI/CD

## Description
<!-- Describe your changes in detail -->
This pull request includes a minor improvement to error message formatting in the `build_unified_connector_service_payment_method` function.

* [`crates/router/src/core/unified_connector_service.rs`](diffhunk://#diff-b8e808846f58e455687a9e192c1c8d192598081aac942628640c42c1d397dfaeL104-R104): Updated the error message to use inline formatting for `payment_method_type`, improving readability and consistency.

### Additional Changes

- [ ] This PR modifies the API contract
- [ ] This PR modifies the database schema
- [ ] This PR modifies application configuration/environment variables

<!--
Provide links to the files with corresponding changes.

Following are the paths where you can find config files:
1. `config`
2. `crates/router/src/configs`
3. `loadtest/config`
-->


## Motivation and Context
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Why is this change required? What problem does it solve?
If it fixes an open issue, please link to the issue here.

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can focus on the implementation (unless it is an obvious bug or documentation fix
that will have little conversation).
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## How did you test it?
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Did you write an integration/unit/API test to verify the code changes?
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## Checklist
<!-- Put an `x` in the boxes that apply -->

- [x] I formatted the code `cargo +nightly fmt --all`
- [x] I addressed lints thrown by `cargo clippy`
- [x] I reviewed the submitted code
- [ ] I added unit tests for my changes where possible


Testing:

Patch:
diff --git a/crates/router/src/core/payment_methods/vault.rs b/crates/router/src/core/payment_methods/vault.rs
index c59a2f84c35..d5848c7f418 100644
--- a/crates/router/src/core/payment_methods/vault.rs
+++ b/crates/router/src/core/payment_methods/vault.rs
@@ -1555,10 +1555,7 @@ pub async fn insert_cvc_using_payment_token(
             .change_context(errors::ApiErrorResponse::InternalServerError)
             .attach_printable("Failed to get redis connection")?;
 
-        let key = format!(
-            "pm_token_{}_{}_hyperswitch_cvc",
-            payment_token, payment_method
-        );
+        let key = format!("pm_token_{payment_token}_{payment_method}_hyperswitch_cvc");
 
         let payload_to_be_encrypted = TemporaryVaultCvc { card_cvc };
 
@@ -1601,10 +1598,7 @@ pub async fn retrieve_and_delete_cvc_from_payment_token(
         .change_context(errors::ApiErrorResponse::InternalServerError)
         .attach_printable("Failed to get redis connection")?;
 
-    let key = format!(
-        "pm_token_{}_{}_hyperswitch_cvc",
-        payment_token, payment_method
-    );
+    let key = format!("pm_token_{payment_token}_{payment_method}_hyperswitch_cvc");
 
     let data = redis_conn
         .get_key::<bytes::Bytes>(&key.clone().into())
diff --git a/crates/router/src/core/unified_connector_service.rs b/crates/router/src/core/unified_connector_service.rs
index d9c00fbadba..3cdcb28d4d8 100644
--- a/crates/router/src/core/unified_connector_service.rs
+++ b/crates/router/src/core/unified_connector_service.rs
@@ -101,8 +101,7 @@ pub fn build_unified_connector_service_payment_method(
                 }
                 _ => {
                     return Err(UnifiedConnectorServiceError::NotImplemented(format!(
-                        "Unimplemented card payment method type: {:?}",
-                        payment_method_type
+                        "Unimplemented card payment method type: {payment_method_type:?}"
                     ))
                     .into());
                 }