[SEC-7924] chore: pin third-party GitHub Actions to commit SHAs

Pin all third-party GitHub Actions to full-length commit SHAs to prevent
supply chain attacks. Addresses findings from the
third-party-action-not-pinned-to-commit-sha Semgrep rule.

Author: pkaeding

.github/actions/install-boost/action.yml

@@ -22,7 +22,7 @@ runs:
   steps:
     - name: Install boost using action
       if: runner.os == 'Linux'
-      uses: MarkusJx/install-boost@v2.4.4
+      uses: MarkusJx/install-boost@3039450bb3dd2e8630d1cf10ec39cb1da3054bbd # v2.4.4
       id: boost-action
       with:
         boost_version: 1.81.0