fix: backoffice/Dockerfile to reduce vulnerabilities (#679)
fix: backoffice/Dockerfile to reduce vulnerabilities (#679)

The following vulnerabilities are fixed with an upgrade:
- https://snyk.io/vuln/SNYK-DEBIAN10-GLIBC-1315333
- https://snyk.io/vuln/SNYK-DEBIAN10-PYTHON27-1063178
- https://snyk.io/vuln/SNYK-DEBIAN10-PYTHON27-1063178
- https://snyk.io/vuln/SNYK-DEBIAN10-PYTHON27-1063178
- https://snyk.io/vuln/SNYK-DEBIAN10-PYTHON27-1063178
hasadna/open_pension,hasadna/open_pension,hasadna/open_pension,hasadna/open_pension,hasadna/open_pension,hasadna/open_pension