chore: improve linting, testing, and GitHub Actions setup (#3583)

- Update golangci-lint version from `v1.48.0` to `v1.52.2`
- Remove Gitter notifications from GitHub Actions workflow
- Add gosec linter settings and include specific rules
- Exclude revive linter for test files
- Remove Gitter badge from README.md
- Delete codecov.yml file
- Change function parameter name in fs.go
- Remove unused parameter in defaultHandleRecovery function

Signed-off-by: appleboy <appleboy.tw@gmail.com>

README.md

@@ -6,7 +6,6 @@
 [![codecov](https://codecov.io/gh/gin-gonic/gin/branch/master/graph/badge.svg)](https://codecov.io/gh/gin-gonic/gin)
 [![Go Report Card](https://goreportcard.com/badge/github.com/gin-gonic/gin)](https://goreportcard.com/report/github.com/gin-gonic/gin)
 [![GoDoc](https://pkg.go.dev/badge/github.com/gin-gonic/gin?status.svg)](https://pkg.go.dev/github.com/gin-gonic/gin?tab=doc)
-[![Join the chat at https://gitter.im/gin-gonic/gin](https://badges.gitter.im/Join%20Chat.svg)](https://gitter.im/gin-gonic/gin?utm_source=badge&utm_medium=badge&utm_campaign=pr-badge&utm_content=badge)
 [![Sourcegraph](https://sourcegraph.com/github.com/gin-gonic/gin/-/badge.svg)](https://sourcegraph.com/github.com/gin-gonic/gin?badge)
 [![Open Source Helpers](https://www.codetriage.com/gin-gonic/gin/badges/users.svg)](https://www.codetriage.com/gin-gonic/gin)
 [![Release](https://img.shields.io/github/release/gin-gonic/gin.svg?style=flat-square)](https://github.com/gin-gonic/gin/releases)
@@ -176,4 +175,4 @@ Awesome project lists using [Gin](https://github.com/gin-gonic/gin) web framewor
 
 Gin is the work of hundreds of contributors. We appreciate your help!
 
-Please see [CONTRIBUTING](CONTRIBUTING.md) for details on submitting patches and the contribution workflow.
+Please see [CONTRIBUTING](CONTRIBUTING.md) for details on submitting patches and the contribution workflow.