Update Github action workflow

[NereusWB922]

Fixes #66

Bumps version:

• actions/checkout: master -> v4
• gradle/wrapper-validation-action: v1 -> v2
• actions/setup-java: v1 -> v4

Changes made:

• Include setup-gradle action (for optimal execution, refer to gradle official)
• Refactor IO redirection test workflow to reduce code duplication

[damithc]

@NereusWB922 Thanks for this PR. Is this an urgent change or can we delay it till next semester? This branch will be put into use very soon (when CS2113 tP starts, so we need to decide now)

[NereusWB922]

@NereusWB922 Thanks for this PR. Is this an urgent change or can we delay it till next semester? This branch will be put into use very soon (when CS2113 tP starts, so we need to decide now)

I don't think it's urgent since the current version isn't causing any issues. We can delay it until next semester without any problems.

[damithc]

@se-edu/tech-team-level1 For your review ...

[damithc]

@NereusWB922 Looks like this PR got messed up after the target branch was rebased. Perhaps close this PR and PR again?

[NereusWB922]

@damithc Hi Prof, just rebased this branch onto the updated target branch.

[damithc]

@NereusWB922 does the behavior remains the same here?