[bugfix] Fix occasional federatingdb test fail

[tsmethurst]

We were getting this issue about half the time:

--- FAIL: TestFollowingTestSuite (0.30s)
    --- FAIL: TestFollowingTestSuite/TestGetFollowing (0.30s)
        following_test.go:48: 
            	Error Trace:	/drone/src/internal/federation/federatingdb/following_test.go:48
            	Error:      	Not equal: 
            	            	expected: "{\"@context\":\"https://www.w3.org/ns/activitystreams\",\"items\":[\"http://localhost:8080/users/admin\",\"http://localhost:8080/users/1happyturtle\"],\"type\":\"Collection\"}"
            	            	actual  : "{\"@context\":\"https://www.w3.org/ns/activitystreams\",\"items\":[\"http://localhost:8080/users/1happyturtle\",\"http://localhost:8080/users/admin\"],\"type\":\"Collection\"}"

This is because the follows in the test rig all had the same created at and updated at, so the order in which they would be selected from the db was not determinate. This fixes that by making the times of test follows 1hr apart.