fix: replace deprecated timezone "Asia/Calcutta" with "Asia/Kolkata" (#2538)

[Keerthana-webdev]

Fixes #2538

Description

The timezone label "Asia/Calcutta" is outdated and has been replaced with the correct and current timezone name "Asia/Kolkata".

Changes Made

• Replaced "Asia/Calcutta" with "Asia/Kolkata" in the relevant configuration file.

Type of Change

• Bug fix (minor update)

Checklist

• Code follows the repository guidelines
• Changes tested locally
• Issue referenced correctly

Summary by Sourcery

Bug Fixes:

• Replace deprecated timezone label "Asia/Calcutta" with the correct "Asia/Kolkata" entry in the event timezone choices.

[sourcery-ai]

Reviewer's guide (collapsed on small PRs)

Reviewer's Guide

Updates the event timezone choices in the initial base migration to use the modern IANA identifier "Asia/Kolkata" instead of the deprecated "Asia/Calcutta" while keeping the rest of the choices list unchanged.

Entity relationship diagram for updated Event timezone choices

erDiagram
  Event_before {
    char_32 timezone
    string choice_Asia_Calcutta
  }

  Event_after {
    char_32 timezone
    string choice_Asia_Kolkata
  }

  Event_before ||--|| Event_after : migrates_to

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File-Level Changes

Change	Details	Files
Replace deprecated timezone identifier with current IANA name in event timezone choices.	Updated the timezone choices tuple in the Event timezone CharField to remove "Asia/Calcutta" and ensure "Asia/Kolkata" is used instead Left all other timezone choices, defaults, help text, and field attributes unchanged to avoid unintended schema changes	app/eventyay/base/migrations/0001_initial.py

Assessment against linked issues

Issue	Objective	Addressed	Explanation
#2538	Replace the outdated timezone label "Asia/Calcutta" with "Asia/Kolkata" everywhere it is used in the application configuration so that the UI displays "Asia/Kolkata" instead of "Asia/Calcutta".	✅

Possibly linked issues

• Replace outdated timezone label "Asia/Calcutta" with "Asia/Kolkata" #2538: PR updates timezone choices, replacing Asia/Calcutta with Asia/Kolkata, exactly fixing the reported UI bug.

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[sourcery-ai]

Hey - I've left some high level feedback:

• Instead of editing 0001_initial.py, create a new schema/data migration that updates the timezone choices and safely maps any existing Asia/Calcutta records to Asia/Kolkata to avoid breaking existing databases or migrations.
• The updated choices list now contains ('Asia/Kolkata', 'Asia/Kolkata') twice; please deduplicate this entry so the choices remain clean and unambiguous.

Prompt for AI Agents

Please address the comments from this code review:

## Overall Comments
- Instead of editing `0001_initial.py`, create a new schema/data migration that updates the timezone choices and safely maps any existing `Asia/Calcutta` records to `Asia/Kolkata` to avoid breaking existing databases or migrations.
- The updated `choices` list now contains `('Asia/Kolkata', 'Asia/Kolkata')` twice; please deduplicate this entry so the choices remain clean and unambiguous.

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