Regenerate bigtable client

[yoshi-automation]

This PR was generated using Autosynth. 🌈

Here's the log from Synthtool:

synthtool > Executing /tmpfs/src/git/autosynth/working_repo/google-cloud-clients/google-cloud-bigtable/synth.py.
synthtool > Ensuring dependencies.
synthtool > Pulling artman image.
latest: Pulling from googleapis/artman
Digest: sha256:f3d61ae45abaeefb6be5f228cda22732c2f1b00fb687c79c4bd4f2c42bb1e1a7
Status: Image is up to date for googleapis/artman:latest
synthtool > Cloning googleapis.
synthtool > Running generator for google/bigtable/artman_bigtable.yaml.
synthtool > Generated code into /home/kbuilder/.cache/synthtool/googleapis/artman-genfiles/java.
synthtool > Running java formatter on 1 files
synthtool > Running java formatter on 51 files
synthtool > Running generator for google/bigtable/admin/artman_bigtableadmin.yaml.
synthtool > Generated code into /home/kbuilder/.cache/synthtool/googleapis/artman-genfiles/java.
synthtool > Running java formatter on 2 files
synthtool > Running java formatter on 109 files
synthtool > Running java formatter on 171 files
synthtool > Cleaned up 0 temporary directories.
synthtool > Wrote metadata to synth.metadata.

[codecov]

Codecov Report

Merging #4564 into master will increase coverage by <.01%.
The diff coverage is n/a.

@@ Coverage Diff @@## master #4564 +/- ##
============================================
+ Coverage 49.19% 49.19% +<.01% - Complexity 21962 21971 +9 
============================================
Files 2077 2077 Lines 207440 207440 Branches 24111 24107 -4 ============================================
+ Hits 102058 102060 +2 + Misses 97206 97205 -1 + Partials 8176 8175 -1

Impacted Files	Coverage Δ	Complexity Δ
...able/gaxx/reframing/ReframingResponseObserver.java	90.82% <0%> (+1.83%)	30% <0%> (+1%)	⬆️

---

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 41a04ee...2fbcb15. Read the comment docs.