Update gitpython version in template installation docs

This is now the version used as standard in all Arduino Tooling projects, which the "template" is intended to be used
with.

Author: per1234

workflow-templates/deploy-mkdocs-versioned-poetry.md

@@ -33,7 +33,7 @@ See the ["Deploy Website" workflow (MkDocs, Poetry) documentation](deploy-mkdocs
 
 1. Run this command:
    ```
-   go tool github.com/go-task/task/v3/cmd/task poetry:install && poetry add --dev "gitpython@^3.1.44" "mike@^1.1.2"
+   go tool github.com/go-task/task/v3/cmd/task poetry:install && poetry add --dev "gitpython@^3.1.45" "mike@^1.1.2"
    ```
 1. Commit the resulting changes to the `pyproject.toml` and `poetry.lock` files.