refactor(pipes-source-alpha): fix function name (#33028)

### Issue # (if applicable)

None

### Reason for this change

Fixed a typo in a function name in code.

### Checklist
- [x] My code adheres to the [CONTRIBUTING GUIDE](https://github.com/aws/aws-cdk/blob/main/CONTRIBUTING.md) and [DESIGN GUIDELINES](https://github.com/aws/aws-cdk/blob/main/docs/DESIGN_GUIDELINES.md)

----

*By submitting this pull request, I confirm that my contribution is made under the terms of the Apache-2.0 license*

Author: andyu17

packages/@aws-cdk/aws-pipes-sources-alpha/lib/streamSource.ts

@@ -90,7 +90,7 @@ export abstract class StreamSource extends SourceWithDeadLetterTarget {
     validateBatchSize(this.sourceParameters.batchSize);
     validateMaximumBatchingWindow(this.sourceParameters.maximumBatchingWindow?.toSeconds());
     validateMaximumRecordAge(this.sourceParameters.maximumRecordAge?.toSeconds());
-    validateMaxiumRetryAttemps(this.sourceParameters.maximumRetryAttempts);
+    validateMaximumRetryAttempts(this.sourceParameters.maximumRetryAttempts);
     validateParallelizationFactor(this.sourceParameters.parallelizationFactor);
   }
 }
@@ -120,7 +120,7 @@ function validateMaximumRecordAge(age?: number) {
   }
 }
 
-function validateMaxiumRetryAttemps(attempts?: number) {
+function validateMaximumRetryAttempts(attempts?: number) {
   if (attempts !== undefined && !Token.isUnresolved(attempts)) {
     if (attempts < -1 || attempts > 10000) {
       throw new Error(`Maximum retry attempts must be between -1 and 10000, received ${attempts}`);

packages/@aws-cdk/aws-pipes-sources-alpha/test/streamSource.test.ts

@@ -199,7 +199,7 @@ describe('stream source validations', () => {
     }).toThrow('Maximum retry attempts must be between -1 and 10000, received 10001');
   });
 
-  it('validateMaxiumRetryAttemps works with a token', () => {
+  it('validateMaximumRetryAttempts works with a token', () => {
     // ARRANGE
     const app = new App();
     const stack = new Stack(app, 'TestStack');