Fix ZetaClient gosec

[lumtis]

Three gosec entries reported recently:

[/github/workspace/zetaclient/evm/evm_client.go:809] - G301 (CWE-276): Expect directory permissions to be 0750 or less (Confidence: HIGH, Severity: MEDIUM)
    808: 		if _, err := os.Stat(dbPath); os.IsNotExist(err) {
  > 809: 			err := os.MkdirAll(dbPath, os.ModePerm)
    810: 			if err != nil {



[/github/workspace/zetaclient/config/config.go:20] - G301 (CWE-276): Expect directory permissions to be 0750 or less (Confidence: HIGH, Severity: MEDIUM)
    19: 	folderPath := filepath.Join(path, folder)
  > 20: 	err := os.MkdirAll(folderPath, os.ModePerm)
    21: 	if err != nil {



[/github/workspace/zetaclient/bitcoin/bitcoin_client.go:1660] - G301 (CWE-276): Expect directory permissions to be 0750 or less (Confidence: HIGH, Severity: MEDIUM)
    1659: 	if _, err := os.Stat(dbpath); os.IsNotExist(err) {
  > 1660: 		err := os.MkdirAll(dbpath, os.ModePerm)
    1661: 		if err != nil {

[skosito]

Caused by using @master as version, which got updated today to v2.20 https://github.com/securego/gosec/releases/tag/v2.20.0 and caught this issue https://github.com/securego/gosec/commit/6fbd381238e97e1d1f3358f0d6d65de78dcf9245.

Currently hardcoded it back to v2.19 which was used before, and this fixes build, but let's use this issue to update this, because there are some useful bug fixes, including this one.