Update base os version

Author: FranzBusch

projects/grpc-swift/project.yaml

@@ -11,3 +11,4 @@ sanitizers:
 - address
 - thread
 main_repo: 'https://github.com/grpc/grpc-swift'
+base_os_version: ubuntu-24-04

projects/swift-nio/project.yaml

@@ -12,3 +12,4 @@ sanitizers:
 - address
 - thread
 main_repo: 'https://github.com/apple/swift-nio.git'
+base_os_version: ubuntu-24-04

projects/swift-protobuf/project.yaml

@@ -13,3 +13,4 @@ sanitizers:
 - thread
 coverage_extra_args: -ignore-filename-regex=.*.pb.swift
 main_repo: 'https://github.com/apple/swift-protobuf.git'
+base_os_version: ubuntu-24-04