chore(deps): update returntocorp/semgrep docker digest to fc421a8

Author: renovate[bot]

.github/workflows/semgrep.yml

@@ -16,7 +16,7 @@ jobs:
     env:
       SEMGREP_APP_TOKEN: ${{ secrets.SEMGREP_APP_TOKEN }}
     container:
-      image: returntocorp/semgrep@sha256:bacb1190716dab2b1708dc63c5bf11f6014c16511e5117f83592acbc5530087a # latest
+      image: returntocorp/semgrep@sha256:fc421a8f9ddba536ae855e6c4831e92ae1418079448d2ac376370217bfac23ac # latest
     steps:
     - uses: actions/checkout@b4ffde65f46336ab88eb53be808477a3936bae11 # v4.1.1
     - run: semgrep ci