Update sbt-github-actions to 0.29.0 (#610)

* Update sbt-github-actions to 0.29.0

* Regenerate GitHub Actions workflow

Executed command: sbt githubWorkflowGenerate

Author: scala-steward

.github/workflows/ci.yml

@@ -27,7 +27,7 @@ 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

@@ -4,4 +4,4 @@ addSbtPlugin("com.github.sbt" % "sbt-pgp" % "2.3.1")
 addSbtPlugin("com.typesafe" % "sbt-mima-plugin" % "1.1.4")
 
 // 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")