Bump github.com/microsoft/vcpkg from master to 2026.01.16 (#6923)

* Bump github.com/microsoft/vcpkg from master to 2026.01.16

Bumps [github.com/microsoft/vcpkg](https://github.com/microsoft/vcpkg) from master to 2026.01.16. This release includes the previously tagged commit.
- [Release notes](https://github.com/microsoft/vcpkg/releases)
- [Commits](microsoft/vcpkg@84bab45...66c0373)

---
updated-dependencies:
- dependency-name: github.com/microsoft/vcpkg
  dependency-version: 2026.01.16
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <[email protected]>

* Update default VCPKG commit string

---------

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>
Co-authored-by: Anton Kolesnyk <[email protected]>

Author: dependabot[bot]

cmake-modules/AzureVcpkg.cmake

@@ -18,7 +18,7 @@ macro(az_vcpkg_integrate)
       message("AZURE_SDK_DISABLE_AUTO_VCPKG is not defined. Fetch a local copy of vcpkg.")
       # GET VCPKG FROM SOURCE
       #  User can set env var AZURE_SDK_VCPKG_COMMIT to pick the VCPKG commit to fetch
-      set(VCPKG_COMMIT_STRING 84bab45d415d22042bd0b9081aea57f362da3f35) # default SDK tested commit
+      set(VCPKG_COMMIT_STRING 66c0373dc7fca549e5803087b9487edfe3aca0a1) # default SDK tested commit
       if(DEFINED ENV{AZURE_SDK_VCPKG_COMMIT})
         message("AZURE_SDK_VCPKG_COMMIT is defined. Using that instead of the default.")
         set(VCPKG_COMMIT_STRING "$ENV{AZURE_SDK_VCPKG_COMMIT}") # default SDK tested commit

vcpkg.json

@@ -1,7 +1,7 @@
 {
   "name": "azure-sdk-for-cpp",
   "version": "1.5.0",
-  "builtin-baseline": "84bab45d415d22042bd0b9081aea57f362da3f35",
+  "builtin-baseline": "66c0373dc7fca549e5803087b9487edfe3aca0a1",
   "dependencies": [
     {
       "name": "curl"