fix: vendor/github.com/creack/pty/Dockerfile.riscv to reduce vulnerabilities

The following vulnerabilities are fixed with an upgrade:
- https://snyk.io/vuln/SNYK-DEBIAN10-NGHTTP2-5953390
- https://snyk.io/vuln/SNYK-DEBIAN10-GIT-6846202
- https://snyk.io/vuln/SNYK-DEBIAN10-GIT-6846202
- https://snyk.io/vuln/SNYK-DEBIAN10-OPENSSH-5788320
- https://snyk.io/vuln/SNYK-DEBIAN10-SYSTEMD-3339153