Change 'history' to 'memory' in the ConversationalAgent prompts

[bilgeyucel]

Related Issues

• Related to Update ConversationalAgent prompts in the hub prompthub#40

Proposed Changes:

Rename {history} as {memory} to have a better consistency

How did you test it?

Ran conversational_agent.py

Notes for the reviewer

N/A

Checklist

• I have read the contributors guidelines and the code of conduct
• I have updated the related issue with new insights and changes
• I added unit tests and updated the docstrings
• I've used one of the conventional commit types for my PR title: fix:, feat:, build:, chore:, ci:, docs:, style:, refactor:, perf:, test:.
• I documented my code
• I ran pre-commit hooks and fixed any issue

[coveralls]

Pull Request Test Coverage Report for Build 5376019104

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 42.994%

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Totals
Change from base Build 5375672125:	0.0%
Covered Lines:	9755
Relevant Lines:	22689

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💛 - Coveralls