Bump actions/cache from 4.0.2 to 4.2.0

Bumps [actions/cache](https://github.com/actions/cache) from 4.0.2 to 4.2.0.
- [Release notes](https://github.com/actions/cache/releases)
- [Changelog](https://github.com/actions/cache/blob/main/RELEASES.md)
- [Commits](0c45773b62...1bd1e32a3b)

---
updated-dependencies:
- dependency-name: actions/cache
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <support@github.com>

.github/workflows/unit_tests.yaml

@@ -10,7 +10,7 @@ jobs:
       uses: actions/setup-go@0a12ed9d6a96ab950c8f026ed9f722fe0da7ef32
       with:
         go-version: 1.19
-    - uses: actions/cache@0c45773b623bea8c8e75f6c82b208c3cf94ea4f9
+    - uses: actions/cache@1bd1e32a3bdc45362d1e726936510720a7c30a57
       with:
         path: |
           ~/go/pkg/mod

ftp.go

@@ -11,7 +11,6 @@ import (
 	"io"
 	"net"
 	"net/textproto"
-	"regexp"
 	"strconv"
 	"strings"
 	"time"
@@ -828,7 +827,7 @@ func (c *ServerConn) CurrentDir() (string, error) {
 	end := strings.LastIndex(msg, "\"")
 
 	if start == -1 || end == -1 {
-		return "", errors.New("unsupported PWD response format")
+		return "", errors.New("unsuported PWD response format")
 	}
 
 	return msg[start+1 : end], nil
@@ -1094,24 +1093,6 @@ func (c *ServerConn) Walk(root string) *Walker {
 	return w
 }
 
-// Search returns all the directories matching the search pattern
-func (c *ServerConn) Search(pattern string) ([]string, error) {
-	_, message, err := c.cmd(StatusCommandOK, "SITE SEARCH %s", pattern)
-	if err != nil {
-		return nil, err
-	}
-
-	msgs := make([]string, 0)
-	re := regexp.MustCompile(`^200-  (?P<Path>.*) \(.*\).*$`)
-	for _, msg := range strings.Split(message, "\n") {
-		if re.MatchString(msg) {
-			msgs = append(msgs, re.ReplaceAllString(msg, "${Path}"))
-		}
-	}
-
-	return msgs, nil
-}
-
 // NoOp issues a NOOP FTP command.
 // NOOP has no effects and is usually used to prevent the remote FTP server to
 // close the otherwise idle connection.