For low-traffic repos like platform_tests most of the commits are dependabot updating the GitHub actions dependencies.

Update all the repositories to stop updating github-actions patch versions.

https://github.com/flutter/platform_tests/blob/6a78997eba85765ef06c925a0ccbd7e2ad6818da/.github/dependabot.yml#L22-L25

  - package-ecosystem: "github-actions"
    directory: "/"
    schedule:
      interval: "daily"
+   ignore:
+     - dependency-name: "*"
+       update-types: ["version-update:semver-patch"]

Example from packages:
https://github.com/flutter/packages/blob/01050136b26c5d60058b412b60b73cee4949d4ab/.github/dependabot.yml#L35-L37

And here's what the commit history looks like platform_tests: