Bump python from 3.12.7-slim to 3.14.3-slim in /infra#5655

dependabot[bot] wants to merge 1 commit intomastermozilla/bugbug:masterfrom

dependabot/docker/infra/python-3.14.3-slimmozilla/bugbug:dependabot/docker/infra/python-3.14.3-slimCopy head branch name to clipboard