chore: Migrate redigo to go-redis, upgrade throttled

[mschfh]

Summary

This PR replaces our outdated redigo dependency with go-redis.

Type of Change

• Product feature
• Bug fix
• Performance improvement
• Refactor
• Other

Tested Environments

• Development
• Staging
• Production

Before Requesting Review

• Does your code build cleanly without any errors or warnings?
• Have you used auto closing keywords?
• Have you added tests for new functionality?
• Have validated query efficiency for new database queries?
• Have documented new functionality in README or in comments?
• Have you squashed all intermediate commits?
• Is there a clear title that explains what the PR does?
• Have you used intuitive function, variable and other naming?
• Have you requested security and/or privacy review if needed
• Have you performed a self review of this PR?

[clD11]

LGTM approved with comments.

[github-actions]

[puLL-Merge] - brave-intl/bat-go@2737

Description

This PR upgrades Redis client library from redigo to go-redis/v9 across the codebase. The change also includes updating the Dockerfile to use build caching and fixing some formatting issues with container stage names. The motivation appears to be modernizing the Redis client usage and improving build performance.

Possible Issues

1. The Redis cache writes no longer specify TTL/expiration times which were previously handled by Redis defaults. This could lead to memory leaks if keys are not properly managed.

2. The removal of Redis connection pooling configuration (previously handled by redigo) means connection management is now entirely handled by go-redis. This may require tuning in production environments.

Security Hotspots

None significant - the changes mainly involve refactoring Redis client usage with equivalent functionality.

Changes

Changes

By filename:

Dockerfile:

• Updated stage naming format (lowercase to uppercase)
• Added build cache mount for Go modules
• Minor formatting changes

libs/clients/coingecko/client.go:

• Replaced redigo Redis client with go-redis/v9
• Updated Redis operations to use new client API
• Removed connection pool management code

libs/middleware/rate_limiter.go:

• Updated rate limiter to use throttled/v2 package
• Changed Redis store implementation to use go-redis/v9
• Simplified rate limiter configuration

services/ratios/cache.go:

• Migrated Redis operations from redigo to go-redis/v9
• Updated sorted set operations syntax
• Removed explicit connection management

sequenceDiagram
    participant App
    participant Redis
    participant Coingecko
    
    App->>Redis: Connect (using go-redis/v9)
    Note over Redis: New connection pool managed by go-redis
    
    App->>Redis: Check cache for market data
    
    alt Cache Miss
        App->>Coingecko: Fetch latest data
        Coingecko-->>App: Return market data
        App->>Redis: Store in cache
    else Cache Hit
        Redis-->>App: Return cached data
    end

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