[CosmosSDK] Upgrade SDK version to >= 0.50.5

[red-0ne]

Objective

Upgrade the CosmosSDK version to 0.50.5 or newer and ensure that dependabot reports dependency security issues.

Origin Document

CosmosSDK had a security issue in versions prior to 0.50.5 and dependabot in the poktroll repository did not catch it.

This is the notification received by shannon-sdk's dependabot [1]:

https://github.com/pokt-network/shannon-sdk/security/dependabot/3

Goals

• Ensure dependabot in the poktroll repository catches future security issues.
• Use a vulnerability-free version of CosmosSDK.

Deliverables

• Upgrade poktroll's CosmosSDK (github.com/cosmos/cosmos-sdk) dependency to version 0.50.5 or newer.
• Make the necessary changes to the poktroll repository to cach future dependency vulnerabilities.

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Creator: [@red-0ne]

[okdas]

• Set up dependabot for security updates and cosmos-sdk releases.
• Bumped cosmos-sdk: [CosmosSDK] Bump to v0.50.7 #682