Change coverage.yml to use python 3.14

Author: rhatgadkar-goog

.github/workflows/coverage.yaml

@@ -42,7 +42,7 @@ jobs:
 
       - name: Calculate base code coverage
         run: |
-          nox --sessions unit-3.13
+          nox --sessions unit-3.14
           coverage report --show-missing
           export CUR_COVER=$(coverage report | awk '$1 == "TOTAL" {print $NF+0}')
           echo "CUR_COVER=$CUR_COVER" >> $GITHUB_ENV
@@ -56,7 +56,7 @@ jobs:
 
       - name: Calculate PR code coverage
         run: |
-          nox --sessions unit-3.13
+          nox --sessions unit-3.14
           coverage report --show-missing
           export PR_COVER=$(coverage report | awk '$1 == "TOTAL" {print $NF+0}')
           echo "PR_COVER=$PR_COVER" >> $GITHUB_ENV