Initial implementation of workflow

[mitchnielsen]

Summary

Adds a workflow to upgrade tools defined in mise.

Modeled after https://github.com/PrefectHQ/actions-updatecli-apply.

Related to https://linear.app/prefect/issue/PLA-961/automate-updating-dependencies-defined-in-mise

Testing

As far as I can tell, we can't really test this workflow until a caller references it (with that change merged to main). So I'd propose we merge this and something like PrefectHQ/prefect-helm#435, test it out, and then I can tweak as needed.

As for manually testing the core change, here's the output in prefect-helm from running the mise upgrade --bump command:

diff --git a/.mise.toml b/.mise.toml
index 4864c64..40bdc2d 100644
--- a/.mise.toml
+++ b/.mise.toml
@@ -1,9 +1,9 @@
 [tools]
-actionlint = '1.7.1'
-github-cli = '2.52.0'
-helm = '3.15'
-helm-ct = '3.11.0'
-helm-docs = '1.13.1'
-pre-commit = '3.8.0'
+actionlint = "1.7.7"
+github-cli = "2.65.0"
+helm = "3.17"
+helm-ct = "3.12.0"
+helm-docs = "1.14.2"
+pre-commit = "4.1.0"
 shellcheck = '0.10.0'
 yamllint = '1.35.1'

[linear]

PLA-961 Automate updating dependencies defined in `mise`

We've recently started using mise to define local tooling dependencies. These are currently not automatically updated to align with new versions. Let's look into automating those updates.

Acceptance criteria

• Dependencies in .mise.toml are automatically updated

[jamiezieziula]

🤘🤘