Migrate away from deprecated ioutil

[sebrandon1]

ioutil has been deprecated since Go 1.16: https://go.dev/doc/go1.16#ioutil

Tracking issue: redhat-best-practices-for-k8s/telco-bot#52

Migration from ioutil to os:

• Replaced ioutil.ReadDir with os.ReadDir for reading directory contents in generator.go.
• Replaced ioutil.WriteFile with os.WriteFile for writing files in generator.go.
• Replaced ioutil.ReadFile with os.ReadFile for reading files in rpm.go.
• Updated import statements to remove ioutil and add os where necessary in both generator.go and rpm.go. [1] [2]

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