Bump alpine from 3.13.5 to 3.14.2 in /mermaid

Bumps alpine from 3.13.5 to 3.14.2.

---
updated-dependencies:
- dependency-name: alpine
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <support@github.com>

mermaid/Dockerfile

@@ -27,7 +27,7 @@ RUN npm run lint && PUPPETEER_EXECUTABLE_PATH=/usr/lib/chromium/chrome npm t
 RUN /usr/local/bin/pkg --targets ${NODE}-${PLATFORM}-${ARCH} . -o app.bin
 
 # Create the image
-FROM alpine:3.13.5
+FROM alpine:3.14.2
 
 RUN addgroup -g 1000 kroki && adduser -D -G kroki -u 1000 kroki