fix: monthly/Dockerfile to reduce vulnerabilities (#673)
fix: monthly/Dockerfile to reduce vulnerabilities (#673)

The following vulnerabilities are fixed with an upgrade:
- https://snyk.io/vuln/SNYK-DEBIAN9-GLIBC-356851
- https://snyk.io/vuln/SNYK-DEBIAN9-GLIBC-356851
- https://snyk.io/vuln/SNYK-DEBIAN9-GLIBC-356851
- https://snyk.io/vuln/SNYK-DEBIAN9-GLIBC-356851
- https://snyk.io/vuln/SNYK-DEBIAN9-GLIBC-356851
hasadna/open_pension,hasadna/open_pension,hasadna/open_pension,hasadna/open_pension,hasadna/open_pension,hasadna/open_pension