Use Avro 1.8-compatible APIs in BigQueryType macro

[clairemcginty]

macros compiled using Avro 1.8 w/ latest Scio snapshot fail with:

[error] /Users/clairem/spotify-scio-2/elitzur-internal-scio/src/test/scala/com/spotify/elitzur/ElitzurValidationTest.scala:134:4: multiple constructors for Field with alternatives:
[error]   (x$1: String,x$2: org.apache.avro.Schema,x$3: String,x$4: Object,x$5: org.apache.avro.Schema.Field.Order)org.apache.avro.Schema.Field <and>
[error]   (x$1: String,x$2: org.apache.avro.Schema,x$3: String,x$4: Object)org.apache.avro.Schema.Field <and>
[error]   (x$1: String,x$2: org.apache.avro.Schema,x$3: String,x$4: org.codehaus.jackson.JsonNode,x$5: org.apache.avro.Schema.Field.Order)org.apache.avro.Schema.Field <and>
[error]   (x$1: String,x$2: org.apache.avro.Schema,x$3: String,x$4: org.codehaus.jackson.JsonNode)org.apache.avro.Schema.Field
[error]  cannot be invoked with (String, org.apache.avro.Schema)
[error]   @BigQueryType.toTable
[error]    ^

solution: use Field constructor that exists across Avro versions

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 61.33%. Comparing base (b5979af) to head (721ded7).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #5616      +/-   ##
==========================================
- Coverage   61.33%   61.33%   -0.01%     
==========================================
  Files         314      314              
  Lines       11255    11257       +2     
  Branches      802      782      -20     
==========================================
+ Hits         6903     6904       +1     
- Misses       4352     4353       +1     

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.