fix: Update ctx BlockTime for simulations (cosmos#10467)

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## Description

When running simulation tests with wasmd I am running into this error: https://github.com/CosmWasm/wasmd/blob/14e58bfa81ea2ade0ff00ebd067ac0bc75e37cf8/x/wasm/types/types.go#L258

This is because when we are running in simulation mode we randomly create a date before the year 9999.  However, if a date is after the year 2262 `UnixNano` will overflow and possibly return a negative number.  To fix this I updated how we set the random genesis start time to be between the epoch and 200 years from now which means this error won't show itself again for another 40+ years. 

Closes: cosmos#10466 

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### Author Checklist

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- [x] included the correct [type prefix](https://github.com/commitizen/conventional-commit-types/blob/v3.0.0/index.json) in the PR title
- [x] added `!` to the type prefix if API or client breaking change
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- [x] added a changelog entry to `CHANGELOG.md`
- [x] included comments for [documenting Go code](https://blog.golang.org/godoc)
- [x] updated the relevant documentation or specification
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I have...

- [ ] confirmed the correct [type prefix](https://github.com/commitizen/conventional-commit-types/blob/v3.0.0/index.json) in the PR title
- [ ] confirmed `!` in the type prefix if API or client breaking change
- [ ] confirmed all author checklist items have been addressed 
- [ ] reviewed state machine logic
- [ ] reviewed API design and naming
- [ ] reviewed documentation is accurate
- [ ] reviewed tests and test coverage
- [ ] manually tested (if applicable)

CHANGELOG.md

@@ -152,6 +152,7 @@ Ref: https://keepachangelog.com/en/1.0.0/
 * [\#10239](https://github.com/cosmos/cosmos-sdk/pull/10239) Fixed x/bank/044 migrateDenomMetadata.
 * (x/upgrade) [\#10189](https://github.com/cosmos/cosmos-sdk/issues/10189) Removed potential sources of non-determinism in upgrades
 * [\#10258](https://github.com/cosmos/cosmos-sdk/issues/10258) Fixes issue related to segmentaiton fault on mac m1 arm64
+* [\#10466](https://github.com/cosmos/cosmos-sdk/issues/10466) Fixes error with simulation tests when genesis start time is randomly created after the year 2262
 
 
 ### State Machine Breaking

types/simulation/rand_util.go

@@ -86,9 +86,16 @@ func RandomDecAmount(r *rand.Rand, max sdk.Dec) sdk.Dec {
 
 // RandTimestamp generates a random timestamp
 func RandTimestamp(r *rand.Rand) time.Time {
-	// json.Marshal breaks for timestamps greater with year greater than 9999
-	unixTime := r.Int63n(253373529600)
-	return time.Unix(unixTime, 0)
+	// json.Marshal breaks for timestamps with year greater than 9999
+	// UnixNano breaks with year greater than 2262
+	start := time.Date(2062, time.Month(1), 1, 1, 1, 1, 1, time.UTC).UnixMilli()
+
+	// Calculate a random amount of time in seconds between 0 and 200 years
+	unixTime := r.Int63n(60*60*24*365*200) * 1000 // convert to milliseconds
+
+	// Get milliseconds for a time between Jan 1, 2062 and Jan 1, 2262
+	rtime := time.UnixMilli(start + unixTime).UnixMilli() / 1000
+	return time.Unix(rtime, 0)
 }
 
 // RandIntBetween returns a random int between two numbers inclusively.