Drop references to requesting review from github-actions[bot]

I'm confident that this was working as described when I wrote this tool,
but GitHub's behavior appears to have changed and requesting review from
the github-actions[bot] doesn't appear to do anything anymore.

We'll have to run the reviewer on push like other GitHub Actions
automations.

README.md

@@ -32,8 +32,3 @@ When a [rosdistro](https://github.com/ros/rosdistro) pull request is opened on G
 
 | ![example GitHub pull request review](docs/github_review.png) |
 |-|
-
-Unlike typical pull request automation, a new review will not be generated when new changes are pushed to the pull request branch. When you feel that you've sufficiently addressed the feedback given in a previous review, you should re-request review from "GitHub Actions" and a fresh analysis will be performed.
-
-| ![requesting re-review from GitHub Actions](docs/github_review_request.png) |
-|-|

rosdistro_reviewer/submitter/github.py

@@ -23,8 +23,6 @@
 ROS Distro includes a very helpful [CONTRIBUTING.md](https://github.com/ros/rosdistro/blob/master/CONTRIBUTING.md) file that we recommend reading if it is your first time submitting a package.
 Please also read the [ROS Distro review guidelines](https://github.com/rosdistro/rosdistro/blob/master/REVIEW_GUIDELINES.md) which summarizes this release process.
 
-If you'd like to run this tool again to generate a new review for your PR, [re-request review from GitHub Actions](https://github.com/ros-infrastructure/rosdistro-reviewer?tab=readme-ov-file#running-rosdistro-reviewer-in-github-actions).
-
 # ROS Distro Considerations
 * ROS Distributions are created using [REP-134 Standards Track](https://ros.org/reps/rep-0143.html) as a guide.
 * Your package name should comply to [REP-144 ROS Package Naming](https://www.ros.org/reps/rep-0144.html)