sql: deflake test with statement_timeout

I saw a CI failure in this test, caused by the `SHOW` statement itself
hitting the 100ms timeout. This points to something being unreasonably
slow on the agent; but it is easy enough to increase this arbitrary
value.

Release note: None

pkg/sql/logictest/testdata/logic_test/set

@@ -292,12 +292,12 @@ SET statement_timeout = '0ms'
 # Test that statement_timeout can be set with an interval string, defaulting to
 # milliseconds as a unit.
 statement ok
-SET statement_timeout = '100'
+SET statement_timeout = '10000'
 
 query T
 SHOW statement_timeout
 ----
-100
+10000
 
 # Set the statement timeout to something absurdly small, so that no query would
 # presumably be able to go through. It should still be possible to get out of