feat(#505): Re-balance upgrade costs

[jeremyckahn]

What this PR does

Per feedback from M8theone on Discord, this PR modifies the costs of various upgrades:

• Increase second and third Field upgrade costs (to $5,000 and $20,000)
• Increase second and third Cow Pen upgrade costs (to $10,000 and $50,000)
• Decrease Combine Harvester cost to $250,000
• Decrease Smelter cost to $250,000
• Increase second and third Cellar upgrades (to $750,000 and $2,000,000)

How this change can be validated

Verify that the costs of relevant upgrades matches what's listed above.

Additional information

I'll wait to get feedback from M8theone about this change before moving it along.

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Name	Status	Preview	Comments	Updated (UTC)
farmhand	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Sep 3, 2024 2:04pm