File source handler ignores changes to the file
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Issue body
### Bug Description
The dump plugin ignores updates to the file.
### To Reproduce
```
parts:
test-service:
plugin: dump
source: test-service.service
source-type: file
```
1. Prime this part.
2. Change test-service.service and try to prime (pack) it again. The resulting content will not be updated.
### part yaml
```shell
```
### Relevant log output
```shell
N/A
```
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