Update grpcio to v1.73.0 (#871)

| datasource | package                | from   | to     |
| ---------- | ---------------------- | ------ | ------ |
| pypi       | grpcio                 | 1.72.1 | 1.73.0 |
| pypi       | grpcio-health-checking | 1.72.1 | 1.73.0 |
| pypi       | grpcio-reflection      | 1.72.1 | 1.73.0 |
| pypi       | grpcio-testing         | 1.72.1 | 1.73.0 |
| pypi       | grpcio-tools           | 1.72.1 | 1.73.0 |

Signed-off-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>
Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Author: renovate[bot]

test/environment/grpc/requirements.txt

@@ -1,5 +1,5 @@
-grpcio==1.72.1
-grpcio-health-checking==1.72.1
-grpcio-reflection==1.72.1
-grpcio-testing==1.72.1
-grpcio-tools==1.72.1
+grpcio==1.73.0
+grpcio-health-checking==1.73.0
+grpcio-reflection==1.73.0
+grpcio-testing==1.73.0
+grpcio-tools==1.73.0

test/requirements.ci.txt

@@ -1,5 +1,5 @@
 docker==7.1.0
-grpcio==1.72.1
+grpcio==1.73.0
 protobuf==6.31.1
 requests==2.32.3
 urllib3==2.4.0