fix: bom version tag misconfigured

[BenWhitehead]

The bom had been miss configured to change the version of google-cloud-datastore to be the version for proto-google-cloud-datastore-v1 this change fixes the marker and the version.

[codecov]

Codecov Report

Merging #42 into master will increase coverage by 0.27%.
The diff coverage is n/a.

@@             Coverage Diff              @@
##             master      #42      +/-   ##
============================================
+ Coverage     59.44%   59.72%   +0.27%     
+ Complexity      384      378       -6     
============================================
  Files            46       46              
  Lines          2286     2262      -24     
  Branches        251      247       -4     
============================================
- Hits           1359     1351       -8     
+ Misses          820      804      -16     
  Partials        107      107

Impacted Files	Coverage Δ	Complexity Δ
...n/java/com/google/cloud/datastore/PathElement.java	79.06% <0%> (-0.48%)	23% <0%> (-3%)
.../src/main/java/com/google/cloud/datastore/Key.java	79.1% <0%> (-0.31%)	16% <0%> (ø)
...java/com/google/cloud/datastore/IncompleteKey.java	87.8% <0%> (-0.3%)	9% <0%> (ø)
.../main/java/com/google/cloud/datastore/BaseKey.java	89.39% <0%> (-0.16%)	14% <0%> (ø)
...va/com/google/cloud/datastore/StructuredQuery.java	71.38% <0%> (-0.08%)	23% <0%> (ø)
...java/com/google/cloud/datastore/DatastoreImpl.java	0% <0%> (ø)	0% <0%> (ø)	⬇️
...a/com/google/cloud/datastore/QueryResultsImpl.java	0% <0%> (ø)	0% <0%> (ø)	⬇️
...in/java/com/google/cloud/datastore/KeyFactory.java	100% <0%> (ø)	7% <0%> (-3%)	⬇️
...ain/java/com/google/cloud/datastore/BatchImpl.java	0% <0%> (ø)	0% <0%> (ø)	⬇️
...va/com/google/cloud/datastore/TransactionImpl.java	0% <0%> (ø)	0% <0%> (ø)	⬇️
... and 2 more

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