[Snyk] Security upgrade golang from 1.19.11 to 1.20.10

[mefellows]

This PR was automatically created by Snyk using the credentials of a real user.

Keeping your Docker base image up-to-date means you’ll benefit from security fixes in the latest version of your chosen image. #### Changes included in this PR - Dockerfile We recommend upgrading to `golang:1.20.10`, as this image has only 70 known vulnerabilities. To do this, merge this pull request, then verify your application still works as expected. Some of the most important vulnerabilities in your base image include: | Severity | Priority Score / 1000 | Issue | Exploit Maturity | | :------: | :-------------------- | :---- | :--------------- | |  | **436** | Heap-based Buffer Overflow
[SNYK-DEBIAN12-CURL-5955014](https://snyk.io/vuln/SNYK-DEBIAN12-CURL-5955014) | Proof of Concept | |  | **436** | Heap-based Buffer Overflow
[SNYK-DEBIAN12-CURL-5955014](https://snyk.io/vuln/SNYK-DEBIAN12-CURL-5955014) | Proof of Concept | |  | **436** | Heap-based Buffer Overflow
[SNYK-DEBIAN12-CURL-5955014](https://snyk.io/vuln/SNYK-DEBIAN12-CURL-5955014) | Proof of Concept | |  | **686** | Out-of-bounds Write
[SNYK-DEBIAN12-GLIBC-5927132](https://snyk.io/vuln/SNYK-DEBIAN12-GLIBC-5927132) | No Known Exploit | |  | **714** | Unquoted Search Path or Element
[SNYK-DEBIAN12-OPENSSH-5788319](https://snyk.io/vuln/SNYK-DEBIAN12-OPENSSH-5788319) | No Known Exploit | --- **Note:** _You are seeing this because you or someone else with access to this repository has authorized Snyk to open fix PRs._ For more information: 🧐 [View latest project report](https://app.snyk.io/org/pact-foundation-808/project/0c88a376-aac5-48c1-baa5-58b7ef92b022?utm_source=github&utm_medium=referral&page=fix-pr) 🛠 [Adjust project settings](https://app.snyk.io/org/pact-foundation-808/project/0c88a376-aac5-48c1-baa5-58b7ef92b022?utm_source=github&utm_medium=referral&page=fix-pr/settings) [//]: # 'snyk:metadata:{"prId":"23d8cc5a-3bbf-4a5d-9538-cff56d6249a4","prPublicId":"23d8cc5a-3bbf-4a5d-9538-cff56d6249a4","dependencies":[{"name":"golang","from":"1.19.11","to":"1.20.10"}],"packageManager":"dockerfile","projectPublicId":"0c88a376-aac5-48c1-baa5-58b7ef92b022","projectUrl":"https://app.snyk.io/org/pact-foundation-808/project/0c88a376-aac5-48c1-baa5-58b7ef92b022?utm_source=github&utm_medium=referral&page=fix-pr","type":"auto","patch":[],"vulns":["SNYK-DEBIAN12-CURL-5955014","SNYK-DEBIAN12-OPENSSH-5788319","SNYK-DEBIAN12-GLIBC-5927132"],"upgrade":["SNYK-DEBIAN12-CURL-5955014","SNYK-DEBIAN12-CURL-5955014","SNYK-DEBIAN12-CURL-5955014","SNYK-DEBIAN12-GLIBC-5927132","SNYK-DEBIAN12-OPENSSH-5788319"],"isBreakingChange":false,"env":"prod","prType":"fix","templateVariants":["updated-fix-title","priorityScore"],"priorityScoreList":[436,714,686],"remediationStrategy":"vuln"}' --- **Learn how to fix vulnerabilities with free interactive lessons:** 🦉 [Learn about vulnerability in an interactive lesson of Snyk Learn.](https://learn.snyk.io/?loc=fix-pr)

[coveralls]

coverage: 37.21%. remained the same when pulling 85ad4e8e2bf88d97d148264ead6141e94ea2cc8a on snyk-fix-b6423007e8f56158cccf487db93ba45d into 731059cac025efce34750044215533847bc2ed25 on master.

[YOU54F]

superseded by https://github.com/pact-foundation/pact-go/pull/370