Cleanup: Lint warnings and deprecated packages (#263)

* Fix lint warnings and std lib deprecations

* Replace deprecated std lib with maintained drop-in replacement fork

Backwartds compatible with original package and suggested by std lib due to security and stability issues.

* OAuth2 is now a direct dependency due to Dropbox

* Undo change

* Revert "Replace deprecated std lib with maintained drop-in replacement fork"

This reverts commit 2887bd409f.

* Update channel handling

* Add linter for PRs

* Rename CI, fetch all issues, add govet

.golangci.yml

@@ -0,0 +1,8 @@
+linters:
+  # Enable specific linter
+  # https://golangci-lint.run/usage/linters/#enabled-by-default
+  enable:
+    - staticcheck
+    - govet
+output:
+  format: github-actions