build(deps): bump ruby/setup-ruby from 1.238.0 to 1.242.0 (fluent#4969)

Bumps [ruby/setup-ruby](https://github.com/ruby/setup-ruby) from 1.238.0
to 1.242.0.

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

.github/workflows/test-ruby-head.yml

@@ -21,7 +21,7 @@ jobs:
     steps:
       - uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4.2.2
       - name: Set up Ruby
-        uses: ruby/setup-ruby@e34163cd15f4bb403dcd72d98e295997e6a55798 # v1.238.0
+        uses: ruby/setup-ruby@cb0fda56a307b8c78d38320cd40d9eb22a3bf04e # v1.242.0
         with:
           ruby-version: ${{ matrix.ruby-version }}
       - name: Install addons

.github/workflows/test.yml

@@ -32,7 +32,7 @@ jobs:
     steps:
       - uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4.2.2
       - name: Set up Ruby
-        uses: ruby/setup-ruby@e34163cd15f4bb403dcd72d98e295997e6a55798 # v1.238.0
+        uses: ruby/setup-ruby@cb0fda56a307b8c78d38320cd40d9eb22a3bf04e # v1.242.0
         with:
           ruby-version: ${{ matrix.ruby-version }}
       - name: Install addons
@@ -53,7 +53,7 @@ jobs:
     steps:
       - uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4.2.2
       - name: Set up Ruby
-        uses: ruby/setup-ruby@e34163cd15f4bb403dcd72d98e295997e6a55798 # v1.238.0
+        uses: ruby/setup-ruby@cb0fda56a307b8c78d38320cd40d9eb22a3bf04e # v1.242.0
         with:
           ruby-version: ${{ matrix.ruby-version }}
       - name: Install dependencies