fix: DatePicker issue observed when selecting date for icelandic language.

[harshith-venkatesh-freshworks]

Checklist:

• My code follows the code style of this project.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have added tests to cover my changes.
• All new and existing tests passed.
• My commits have standard messages as mentioned in Contributing Guidelines

How Has This Been Tested?

version: 2.28.0
date-fns/locale = is

import { formatISO, parse } from 'date-fns';
import { is } from 'date-fns/locale';

const values = [
'12 jan. 2024',
'06 feb. 2024',
'06 mars 2024',
'17 apríl 2024',
'07 maí 2024',
'13 júní 2024',
'18 júlí 2024',
'04 sept. 2024',
'23 okt. 2024',
'15 nóv. 2024',
'04 des. 2024'
];

const formattedDates = values.map((value) => {
try {
const parsedDate = formatISO(
parse(value, 'dd MMMM yyyy', new Date(), { locale: is })
);
return parsedDate;
} catch (error) {
console.info(value, error);
}
});

console.log(formattedDates);

For the above code, we are observing the parsing is not occuring for the month sept. , okt. , nov., des.
We are observing the below error.

Stackblitz link for reference: https://stackblitz.com/edit/date-fns-bug-theqmk?file=package.json,index.ts

We are observing the same issue, even in the current version as well. 4.1.0
We have raised the PR with date-fns team to resolve this issue.
date-fns/date-fns#3934

This is a fix to resolve the date picker flow till our changes are merged.

[harshith-venkatesh-freshworks]

https://github.com/date-fns/date-fns/blob/main/src/locale/is/snapshot.md
The above snapshot provides further details on which dateFormat leads to how many invalid dates, based on this we have chosen dd MMMM yyyy format for parsing purpose

[rihansiddhi]

LGTM. please fix the checks