Update actions/setup-java digest to 3a4f6e1 (#1796)

Co-authored-by: elastic-renovate-prod[bot] <174716857+elastic-renovate-prod[bot]@users.noreply.github.com>

Author: elastic-renovate-prod[bot]

.github/workflows/add_plugin_placeholder_in_vpr.yml

@@ -25,7 +25,7 @@ jobs:
       - uses: ruby/setup-ruby@v1
         with:
           ruby-version: jruby
-      - uses: actions/setup-java@7a6d8a8234af8eb26422e24e3006232cccaa061b # v4
+      - uses: actions/setup-java@3a4f6e1af504cf6a31855fa899c6aa5355ba6c12 # v4
         with:
           distribution: 'temurin'
           java-version: '17'

.github/workflows/reference_docs.yml

@@ -23,7 +23,7 @@ jobs:
       - uses: ruby/setup-ruby@v1
         with:
           ruby-version: jruby
-      - uses: actions/setup-java@7a6d8a8234af8eb26422e24e3006232cccaa061b # v4
+      - uses: actions/setup-java@3a4f6e1af504cf6a31855fa899c6aa5355ba6c12 # v4
         with:
           distribution: 'temurin'
           java-version: '17'

.github/workflows/vpr.yml

@@ -16,7 +16,7 @@ jobs:
       - uses: ruby/setup-ruby@v1
         with:
           ruby-version: jruby
-      - uses: actions/setup-java@7a6d8a8234af8eb26422e24e3006232cccaa061b # v4
+      - uses: actions/setup-java@3a4f6e1af504cf6a31855fa899c6aa5355ba6c12 # v4
         with:
           distribution: 'temurin'
           java-version: '17'