Always set SQLITE_OPEN_URI on in-memory sqlite

[LecrisUT]

Does your PR solve an issue?

I have encountered this issue when trying to package a downstream project where the in-memory sqlite database was simply gone at subsequent accesses. The issue is that URI format is implicitly used, but the flag is never set

sqlx/sqlx-sqlite/src/options/parse.rs

Lines 18 to 23 in 1388fc8

	if database == ":memory:" {
	options.in_memory = true;
	options.shared_cache = true;
	let seqno = IN_MEMORY_DB_SEQ.fetch_add(1, Ordering::Relaxed);
	options.filename = Cow::Owned(PathBuf::from(format!("file:sqlx-in-memory-{seqno}")));
	} else {

This issue was not detected because only the bundled libsqlite3-sys version is tested which has the USE_URI compile flag enabled. On distros, however this is not yet enabled, and it is just started to be investigated ¹

Related to:

• sqlite in-memory databases do not seem to work with connection pools #2510
• Opening "sqlite::memory:" is broken for SqlitePool #362 (comment)

Footnotes

1. https://bugzilla.redhat.com/show_bug.cgi?id=2291157 ↩

[LecrisUT]

PS: I am targeting ab/fixes right now because of the format CI changes, I will rebase and change targets once #3279 is merged