Backport #8332: Implement caching for JWKSet #681

Job	Run time
build	5m 4s
compute-versions	3s
test (6.0-beta.1+cbd71e8, https://packages.edgedb.com/archive/x86_64-unknown-linux-gnu.testing/ed...	11m 21s
test (6.0-beta.1+cbd71e8, https://packages.edgedb.com/archive/x86_64-unknown-linux-gnu.testing/ed...	10m 31s
test (6.0-beta.2+4c461f7, https://packages.edgedb.com/archive/x86_64-unknown-linux-gnu.testing/ed...	11m 30s
test (6.0-beta.2+4c461f7, https://packages.edgedb.com/archive/x86_64-unknown-linux-gnu.testing/ed...	10m 30s
test (6.0-rc.1+983c12e, https://packages.edgedb.com/archive/x86_64-unknown-linux-gnu.testing/gel-...	10m 48s
test (6.0-rc.1+983c12e, https://packages.edgedb.com/archive/x86_64-unknown-linux-gnu.testing/gel-...	10m 26s
Notify in Slack on failures	0s
	1h 10m 13s

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