Gradle: fix 'hedera-protobufs' git pull

[jjohannes]

Description:

Fixes an issue introduced in #9651
If the branch is already checked out, the build wouldn't update it, because we only usedfetch.

Checklist

• Documented (Code comments, README, etc.)
• Tested (unit, integration, etc.)

[github-actions]

Node: Unit Test Results

    2 283 files  ±0      2 283 suites  ±0   1h 16m 11s ⏱️ +59s
118 366 tests ±0  118 332 ✔️ ±0  34 💤 ±0  0 ❌ ±0 
126 684 runs  ±0  126 650 ✔️ ±0  34 💤 ±0  0 ❌ ±0 

Results for commit 9dafb94. ± Comparison against base commit 7417fee.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

❗ No coverage uploaded for pull request base (develop@7417fee). Click here to learn what that means.

Additional details and impacted files

@@            Coverage Diff             @@
##             develop   #10061   +/-   ##
==========================================
  Coverage           ?   65.27%           
  Complexity         ?    30195           
==========================================
  Files              ?     3325           
  Lines              ?   126812           
  Branches           ?    13185           
==========================================
  Hits               ?    82778           
  Misses             ?    40823           
  Partials           ?     3211           

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[github-actions]

Node: E2E Test Results

    1 files      1 suites   22m 2s ⏱️
310 tests 310 ✔️ 0 💤 0 ❌
332 runs  332 ✔️ 0 💤 0 ❌

Results for commit 9dafb94.

[github-actions]

Node: Integration Test Results

279 tests   279 ✔️  28m 18s ⏱️
    5 suites      0 💤
    5 files        0 ❌

Results for commit 9dafb94.

[github-actions]

Node: HAPI Test Results

1 245 tests   968 ✔️  1h 38m 19s ⏱️
   166 suites  277 💤
   166 files        0 ❌

Results for commit 9dafb94.