[azure-core-cpp] Update to 1.8.1 (#30703)

## 1.8.1 (2023-04-06)

### Bugs Fixed

- [[#4213]](https://github.com/Azure/azure-sdk-for-cpp/issues/4213) Fixed a bug where `Host` request header is not set for non-default port (80, 443).
- [[#4443]](https://github.com/Azure/azure-sdk-for-cpp/issues/4443) Fixed potentially high CPU usage on Windows.

### Other Changes

- Libcurl transport doesn't add `Content-Length` request header for GET/HEAD/DELETE requests anymore.

ports/azure-core-cpp/portfile.cmake

@@ -1,8 +1,8 @@
 vcpkg_from_github(
     OUT_SOURCE_PATH SOURCE_PATH
     REPO Azure/azure-sdk-for-cpp
-    REF azure-core_1.8.0
-    SHA512 13d49b79dbc9e5c2fd8ce019e76b2ba92258174f7b12945eae67c7451548ada4afc059023b5092c3de7ce77bc4bb0954a5c483b8451aeefde4a3133401ace632
+    REF azure-core_1.8.1
+    SHA512 2a488215262a7ae9a05c5d066cdca7400da38ae1a7848ef6ae3e16bc73e3ebd9a38a0307613f5bac1c38681508c314d26e3ce4b4fb4eef4e58eec1a792c085ed
 )
 
 vcpkg_check_features(
@@ -13,7 +13,7 @@ vcpkg_check_features(
 )
 
 vcpkg_cmake_configure(
-    SOURCE_PATH ${SOURCE_PATH}/sdk/core/azure-core/
+    SOURCE_PATH "${SOURCE_PATH}/sdk/core/azure-core/"
     OPTIONS
         ${FEATURE_OPTIONS}
         -DWARNINGS_AS_ERRORS=OFF

ports/azure-core-cpp/vcpkg.json

@@ -1,6 +1,6 @@
 {
   "name": "azure-core-cpp",
-  "version-semver": "1.8.0",
+  "version-semver": "1.8.1",
   "description": [
     "Microsoft Azure Core SDK for C++",
     "This library provides shared primitives, abstractions, and helpers for modern Azure SDK client libraries written in the C++."

versions/a-/azure-core-cpp.json

@@ -1,5 +1,10 @@
 {
   "versions": [
+    {
+      "git-tree": "66add6b6952292833b50c4f3bbcf9ea90d192b38",
+      "version-semver": "1.8.1",
+      "port-version": 0
+    },
     {
       "git-tree": "a18e2b1efaf5843b0eb5fe27a88c4306d5572970",
       "version-semver": "1.8.0",

versions/baseline.json

@@ -389,7 +389,7 @@
       "port-version": 0
     },
     "azure-core-cpp": {
-      "baseline": "1.8.0",
+      "baseline": "1.8.1",
       "port-version": 0
     },
     "azure-core-tracing-opentelemetry-cpp": {