ci: run Package CI, Changeset, and Release on ubuntu-latest (#82)

windows-latest jobs sat queued with zero runners after #81, #75, and #80.

Co-authored-by: Cursor Agent <cursoragent@cursor.com>
Co-authored-by: Zack Jackson <ScriptedAlchemy@users.noreply.github.com>

Author: ScriptedAlchemy

.github/workflows/changeset.yml

@@ -17,7 +17,7 @@ concurrency:
 jobs:
   changeset:
     name: Changeset present
-    runs-on: windows-latest
+    runs-on: ubuntu-latest
     timeout-minutes: 10
     steps:
       # `changeset status --since=origin/main` diffs against the merge-base.

.github/workflows/ci.yml

@@ -14,7 +14,7 @@ concurrency:
 
 jobs:
   package:
-    runs-on: windows-latest
+    runs-on: ubuntu-latest
     timeout-minutes: 10
     steps:
       - name: Check out the repository

.github/workflows/release.yml

@@ -16,7 +16,7 @@ concurrency:
 
 jobs:
   release:
-    runs-on: windows-latest
+    runs-on: ubuntu-latest
     timeout-minutes: 15
     steps:
       - name: Check out the repository