fix: fix release-please action (hpc-maths#41)

<!-- Thank you for your contribution to ponio! -->
<!-- ༊彡 -->

<!-- Please check the following before submitting your PR -->
- [x] I have installed [pre-commit](https://pre-commit.com/) locally and
use it to validate my commits.
- [x] The PR title follows the [conventional
commits](https://www.conventionalcommits.org/en/v1.0.0/) convention.
Available tags: 'build', 'chore', 'ci', 'docs', 'feat', 'fix', 'perf',
'refactor', 'revert', 'style', 'test'
- [x] This new PR is documented.
- [x] This new PR is tested.

## Description
<!-- A clear and concise description of what you have done in this PR.
-->

Set first version to `0.0.0` like in
[splinart-cpp#12](https://github.com/gouarin/splinart-cpp/pull/12/files)

## Related issue
<!-- List the issues solved by this PR, if any. -->

## How has this been tested?
<!-- Give the list of files used to test this new implementation. -->

## Code of Conduct
By submitting this PR, you agree to follow our [Code of
Conduct](https://github.com/hpc-maths/ponio/blob/master/solver/doc/CODE_OF_CONDUCT.md)
- [x] I agree to follow this project's Code of Conduct

.release-please-manifest.json

@@ -1,3 +1,3 @@
 {
-    ".": "0.0.1"
+    ".": "0.0.0"
 }