Update sbt-github-actions to 0.29.0 (#456)

* Update sbt-github-actions to 0.29.0

* Regenerate GitHub Actions workflow

Executed command: sbt githubWorkflowGenerate

Author: scala-steward

.github/workflows/ci.yml

@@ -29,7 +29,7 @@ jobs:
     runs-on: ${{ matrix.os }}
     steps:
       - name: Checkout current branch (full)
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
         with:
           fetch-depth: 0
 

project/plugins.sbt

@@ -20,7 +20,7 @@ addSbtPlugin("ch.epfl.scala" % "sbt-bloop" % "2.0.17")
 addSbtPlugin("org.scalameta" % "sbt-scalafmt" % "2.5.6")
 
 // https://github.com/djspiewak/sbt-github-actions
-addSbtPlugin("com.github.sbt" % "sbt-github-actions" % "0.28.0")
+addSbtPlugin("com.github.sbt" % "sbt-github-actions" % "0.29.0")
 
 // https://github.com/sbt/sbt-projectmatrix
 addSbtPlugin("com.eed3si9n" % "sbt-projectmatrix" % "0.11.0")