Post-processor compression results in crash

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#### Overview of the Issue

When using a post-processor to compress the final output image, packer crashes. This issue has cropped up only recently in the past few months on projects that built successfully before.

#### Reproduction Steps

Use a post-processor that compresses to a .gz file:

```
"post-processors": [
[
{
"compression_level": 6,
"format": ".gz",
"keep_input_artifact": true,
"output": "build/artifact.raw.gz",
"type": "compress"
}
]
],
```
an example of a project that has this issue: https://github.com/Logicwax/airgap

### Packer version

From ` 1.6.6 [go1.18.1 linux amd64]`

### Operating system and Environment details

Ubuntu 22.04, kernel 5.19.0-38-generic, intel i7.

### Log Fragments and crash.log files
https://gist.github.com/Logicwax/d36c764df5f356dc3b83572e9bd0c261

Start by reproducing the crash with the supplied compress post-processor configuration on Packer 1.6.6 and inspect the linked crash log and example project. Trace the post-processor compression entry point and verify that producing the .gz artifact completes without a crash, including the keep_input_artifact case.

Written by the indexing model from the issue text.