deps: update dependency com.google.protobuf:protobuf-bom to v3.11.4

[renovate-bot]

This PR contains the following updates:

Package	Update	Change
com.google.protobuf:protobuf-bom (source)	patch	3.11.3 -> 3.11.4

---

Release Notes

protocolbuffers/protobuf

v3.11.4

Compare Source

C#

• Fix latest ArgumentException for C# extensions (#​7188)
• Enforce recursion depth checking for unknown fields (#​7210)

Ruby

• Fix wrappers with a zero value (#​7195)
• Fix JSON serialization of 0/empty-valued wrapper types (#​7198)

---

Renovate configuration

📅 Schedule: At any time (no schedule defined).

🚦 Automerge: Disabled by config. Please merge this manually once you are satisfied.

♻️ Rebasing: Whenever PR becomes conflicted, or if you tick the rebase/retry checkbox below.

🔕 Ignore: Close this PR and you won't be reminded about this update again.

---

• If you want to rebase/retry this PR, check this box

---

This PR has been generated by WhiteSource Renovate. View repository job log here.

[codecov]

Codecov Report

Merging #134 into master will decrease coverage by 0.11%.
The diff coverage is n/a.

@@ Coverage Diff @@## master #134 +/- ##
============================================
- Coverage 63.77% 63.65% -0.12% 
Complexity 540 540 ============================================
Files 30 30 Lines 4745 4735 -10 Branches 456 441 -15 ============================================
- Hits 3026 3014 -12 + Misses 1564 1562 -2 - Partials 155 159 +4

Impacted Files	Coverage Δ	Complexity Δ
...in/java/com/google/cloud/storage/StorageBatch.java	88% <0%> (-4%)	13% <0%> (ø)
...main/java/com/google/cloud/storage/BucketInfo.java	80.71% <0%> (-0.34%)	84% <0%> (ø)
...ain/java/com/google/cloud/storage/StorageImpl.java	78.67% <0%> (-0.12%)	120% <0%> (ø)
...om/google/cloud/storage/spi/v1/HttpStorageRpc.java	1.64% <0%> (ø)	1% <0%> (ø)	⬇️

---

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 5da3e8d...98c3cd9. Read the comment docs.