Memory error on macos-26 runners

### Describe the bug

For our tests on macos-26 we set `MallocStackLogging=1` to catch any stack allocation errors. When moving to macos-26, I started seeing it when calling the AWS CLI.

I created a simple workflow that shows the problem.

https://github.com/jeffadair/aws_macos_error/actions/runs/26888603504/job/79307836582#step:3:38

### Regression Issue

- [x] Select this option if this issue appears to be a regression.

### Expected Behavior

Fix the memory error so it is no longer flagged by the system.

### Current Behavior

After setting the `MallocStackLogging=1` env var, running `aws --version` will cause and error thrown by the system.

### Reproduction Steps

After setting the `MallocStackLogging=1` env var, running `aws --version` will cause and error thrown by the system.

This workflow will reproduce it: https://github.com/jeffadair/aws_macos_error/blob/main/.github/workflows/repro.yml

### Possible Solution

_No response_

### Additional Information/Context

_No response_

### CLI version used

aws-cli/2.34.53 Python/3.14.5 Darwin/25.4.0 exe/arm64

### Environment details (OS name and version, etc.)

macos-26 runner