chore(deps-dev): bump @semantic-release/github from 5.5.5 to 5.5.8

Bumps [@semantic-release/github](https://github.com/semantic-release/github) from 5.5.5 to 5.5.8.
- [Release notes](https://github.com/semantic-release/github/releases)
- [Commits](semantic-release/github@v5.5.5...v5.5.8)

Signed-off-by: dependabot-preview[bot] <[email protected]>

package.json

@@ -91,7 +91,7 @@
     "@semantic-release/changelog": "^3.0.5",
     "@semantic-release/commit-analyzer": "^6.3.2",
     "@semantic-release/git": "^7.0.17",
-    "@semantic-release/github": "^5.5.5",
+    "@semantic-release/github": "^5.5.8",
     "@semantic-release/release-notes-generator": "^7.3.2",
     "babel-eslint": "^10.0.3",
     "eslint": "^6.6.0",

yarn.lock

@@ -1036,10 +1036,10 @@
     micromatch "^4.0.0"
     p-reduce "^2.0.0"
 
-"@semantic-release/github@^5.1.0", "@semantic-release/github@^5.5.5":
-  version "5.5.5"
-  resolved "https://registry.yarnpkg.com/@semantic-release/github/-/github-5.5.5.tgz#4666367f16d8ad91fd1d3c71a7238498de14ec38"
-  integrity sha512-Wo9OIULMRydbq+HpFh9yiLvra1XyEULPro9Tp4T5MQJ0WZyAQ3YQm74IdT8Pe/UmVDq2nfpT1oHrWkwOc4loHg==
+"@semantic-release/github@^5.1.0", "@semantic-release/github@^5.5.8":
+  version "5.5.8"
+  resolved "https://registry.yarnpkg.com/@semantic-release/github/-/github-5.5.8.tgz#2c16d212ca057ba0b0553b6eb62ff0949cfbca6a"
+  integrity sha512-YxbBXbCThs/Xk3E4QU01AMIUM8eb0UTvjHJtclTDR3/DEW7kUpmXQqBMnSh3qCTuk4scRFIoaF0fGU/0xByZug==
   dependencies:
     "@octokit/rest" "^16.27.0"
     "@semantic-release/error" "^2.2.0"
@@ -1049,8 +1049,8 @@
     dir-glob "^3.0.0"
     fs-extra "^8.0.0"
     globby "^10.0.0"
-    http-proxy-agent "^2.1.0"
-    https-proxy-agent "^3.0.0"
+    http-proxy-agent "^3.0.0"
+    https-proxy-agent "^4.0.0"
     issue-parser "^5.0.0"
     lodash "^4.17.4"
     mime "^2.4.3"