go.mod: upgrade go.etcd.io/bbolt to fix panic in unit test with go1.14 (#2690)

[ti-srebot]

cherry-pick #2690 to release-4.0

---

Signed-off-by: JmPotato ghzpotato@gmail.com

What problem does this PR solve?

Fix panic in unit test with go >= 1.14. ref: etcd-io/bbolt#201

What is changed and how it works?

Replace etcd-io/bbolt version to the latest one.

Check List

Tests

• Unit test
• Integration test

Code changes

• Has go.mod change

Release note

• No release note

[sre-bot]

No release note, Please follow https://github.com/pingcap/community/blob/master/contributors/release-note-checker.md

[sre-bot]

No release note, Please follow https://github.com/pingcap/community/blob/master/contributors/release-note-checker.md

[HunDunDM]

/rebuild

[codecov]

Codecov Report

Merging #3331 (2cacf67) into release-4.0 (b720955) will decrease coverage by 0.07%.
The diff coverage is n/a.

@@               Coverage Diff               @@
##           release-4.0    #3331      +/-   ##
===============================================
- Coverage        74.84%   74.77%   -0.08%     
===============================================
  Files              209      209              
  Lines            19628    19628              
===============================================
- Hits             14691    14676      -15     
- Misses            3619     3623       +4     
- Partials          1318     1329      +11     

Flag	Coverage Δ
unittests	74.77% <ø> (-0.08%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
pkg/tempurl/tempurl.go	60.00% <0.00%> (-10.00%)	⬇️
server/id/id.go	76.19% <0.00%> (-4.77%)	⬇️
pkg/mock/mockhbstream/mockhbstream.go	88.88% <0.00%> (-3.71%)	⬇️
pkg/etcdutil/etcdutil.go	82.35% <0.00%> (-2.95%)	⬇️
server/server.go	72.80% <0.00%> (-1.83%)	⬇️
server/grpc_service.go	59.07% <0.00%> (-1.21%)	⬇️
server/core/storage.go	67.88% <0.00%> (-0.92%)	⬇️
server/cluster/cluster.go	79.20% <0.00%> (-0.50%)	⬇️
client/client.go	69.54% <0.00%> (ø)
server/tso/tso.go	78.98% <0.00%> (+1.44%)	⬆️
... and 2 more

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update b720955...2cacf67. Read the comment docs.

[Yisaer]

LGTM

[Yisaer]

/merge

[ti-chi-bot]

@Yisaer: It seems you want to merge this PR, I will help you trigger all the tests:

/run-all-tests

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the ti-community-infra/ti-community-prow repository.

[ti-chi-bot]

@Yisaer: /merge in this pull request requires 2 /lgtm.

In response to this:

/merge

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the ti-community-infra/ti-community-prow repository.

[nolouch]

/merge

[ti-chi-bot]

@nolouch: It seems you want to merge this PR, I will help you trigger all the tests:

/run-all-tests

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the ti-community-infra/ti-community-prow repository.

[ti-chi-bot]

This pull request has been accepted and is ready to merge.

Commit hash: 2cacf67