Update SIG meeting details

[smaddock]

opentelemetry-php/CONTRIBUTING.md

Lines 309 to 310 in 7033191

	Our meetings are held weekly on zoom on Wednesdays at 10:30am PST / 1:30pm EST.
	A Google calendar invite with the included zoom link can be found [here](https://calendar.google.com/event?action=TEMPLATE&tmeid=N2VtZXZmYnVmbzZkYjZkbTYxdjZvYTdxN21fMjAyMDA5MTZUMTczMDAwWiBrYXJlbnlyeHVAbQ&tmsrc=google.com_b79e3e90j7bbsa2n2p5an5lf60%40group.calendar.google.com&scp=ALL)

• The time needs to move up
• Google Calendar invite updated
• Possibly also link to the Google Doc

I can submit a PR but don't know how to update the calendar invite.