chore: remove group go.mod (cosmos#10971)

## Description

Closes: cosmos#10970 



---

### Author Checklist

*All items are required. Please add a note to the item if the item is not applicable and
please add links to any relevant follow up issues.*

I have...

- [ ] included the correct [type prefix](https://github.com/commitizen/conventional-commit-types/blob/v3.0.0/index.json) in the PR title
- [ ] added `!` to the type prefix if API or client breaking change
- [ ] targeted the correct branch (see [PR Targeting](https://github.com/cosmos/cosmos-sdk/blob/master/CONTRIBUTING.md#pr-targeting))
- [ ] provided a link to the relevant issue or specification
- [ ] followed the guidelines for [building modules](https://github.com/cosmos/cosmos-sdk/blob/master/docs/building-modules)
- [ ] included the necessary unit and integration [tests](https://github.com/cosmos/cosmos-sdk/blob/master/CONTRIBUTING.md#testing)
- [ ] added a changelog entry to `CHANGELOG.md`
- [ ] included comments for [documenting Go code](https://blog.golang.org/godoc)
- [ ] updated the relevant documentation or specification
- [ ] reviewed "Files changed" and left comments if necessary
- [ ] confirmed all CI checks have passed

### Reviewers Checklist

*All items are required. Please add a note if the item is not applicable and please add
your handle next to the items reviewed if you only reviewed selected items.*

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)

.github/dependabot.yml

@@ -60,11 +60,3 @@ updates:
   labels:
   - automerge
   - dependencies
-- package-ecosystem: gomod
-  directory: "/x/group"
-  schedule:
-    interval: daily
-  open-pull-requests-limit: 10
-  labels:
-  - automerge
-  - dependencies

contrib/images/simd-env/Dockerfile

@@ -3,7 +3,6 @@ RUN apk add build-base git linux-headers
 WORKDIR /work
 COPY go.mod go.sum /work/
 COPY db/go.mod db/go.sum /work/db/
-COPY x/group/go.mod x/group/go.sum /work/x/group/
 COPY errors/go.mod errors/go.sum /work/errors/
 
 RUN go mod download

go.mod

@@ -7,13 +7,13 @@ require (
 	github.com/armon/go-metrics v0.3.10
 	github.com/bgentry/speakeasy v0.1.0
 	github.com/btcsuite/btcd v0.22.0-beta
+	github.com/cockroachdb/apd/v2 v2.0.2
 	github.com/coinbase/rosetta-sdk-go v0.7.2
 	github.com/confio/ics23/go v0.6.6
 	github.com/cosmos/btcutil v1.0.4
 	github.com/cosmos/cosmos-proto v1.0.0-alpha6
 	github.com/cosmos/cosmos-sdk/db v0.0.0
 	github.com/cosmos/cosmos-sdk/errors v1.0.0-beta.2
-	github.com/cosmos/cosmos-sdk/x/group v0.0.0-00010101000000-000000000000
 	github.com/cosmos/go-bip39 v1.0.0
 	github.com/cosmos/iavl v0.17.3
 	github.com/cosmos/ledger-cosmos-go v0.11.1
@@ -53,6 +53,7 @@ require (
 	google.golang.org/genproto v0.0.0-20211208223120-3a66f561d7aa
 	google.golang.org/grpc v1.43.0
 	google.golang.org/protobuf v1.27.1
+	pgregory.net/rapid v0.4.7
 	sigs.k8s.io/yaml v1.3.0
 )
 
@@ -67,7 +68,6 @@ require (
 	github.com/cenkalti/backoff/v4 v4.1.1 // indirect
 	github.com/cespare/xxhash v1.1.0 // indirect
 	github.com/cespare/xxhash/v2 v2.1.2 // indirect
-	github.com/cockroachdb/apd/v2 v2.0.2 // indirect
 	github.com/cosmos/ledger-go v0.9.2 // indirect
 	github.com/danieljoos/wincred v1.0.2 // indirect
 	github.com/davecgh/go-spew v1.1.1 // indirect
@@ -157,5 +157,3 @@ replace github.com/99designs/keyring => github.com/cosmos/keyring v1.1.7-0.20210
 replace github.com/gin-gonic/gin => github.com/gin-gonic/gin v1.7.0
 
 replace github.com/cosmos/cosmos-sdk/db => ./db
-
-replace github.com/cosmos/cosmos-sdk/x/group => ./x/group