[cppitertools] update to version 2.1

[Roy-Fokker]

Describe the pull request

• What does your PR fix?

Updates CppIterTools port to version 2.1

• Which triplets are supported/not supported? Have you updated the CI baseline?

Should work for all triplets. But tested only on windows. Don't have other environments to test on.

• Does your PR follow the maintainer guide?

Yes

• If you have added/updated a port: Have you run ./vcpkg x-add-version --all and committed the result?

  I think i did this correctly.

If you are still working on the PR, open it as a Draft: https://github.blog/2019-02-14-introducing-draft-pull-requests/

[github-actions]

This is a new experimental fast check for PR issues. Please let us know if this bot is helpful!

After committing all other changes, the version database must be updated

git add -u && git commit
git checkout 5742e878fc71b4fcb9c019b50f1f887f22db58df -- versions
./vcpkg x-add-version --all

Diff

diff --git a/versions/c-/cppitertools.json b/versions/c-/cppitertools.json
index cb19009..1aaf441 100644
--- a/versions/c-/cppitertools.json
+++ b/versions/c-/cppitertools.json
@@ -1,5 +1,10 @@
 {
   "versions": [
+    {
+      "git-tree": "9b4908a6183e914b33014a6b2f640df56e99d9f0",
+      "version-string": "2.1",
+      "port-version": 0
+    },
     {
       "git-tree": "6f5ac65e92858f04e97468de01d59b60c0eac058",
       "version-string": "2.0",

[github-actions]

This is a new experimental fast check for PR issues. Please let us know if this bot is helpful!

After committing all other changes, the version database must be updated

git add -u && git commit
git checkout 5742e878fc71b4fcb9c019b50f1f887f22db58df -- versions
./vcpkg x-add-version --all

Diff

diff --git a/versions/baseline.json b/versions/baseline.json
index 19650fa..342cbde 100644
--- a/versions/baseline.json
+++ b/versions/baseline.json
@@ -1449,7 +1449,7 @@
       "port-version": 0
     },
     "cppitertools": {
-      "baseline": "2.0",
+      "baseline": "2.1",
       "port-version": 0
     },
     "cppkafka": {
diff --git a/versions/c-/cppitertools.json b/versions/c-/cppitertools.json
index cb19009..1aaf441 100644
--- a/versions/c-/cppitertools.json
+++ b/versions/c-/cppitertools.json
@@ -1,5 +1,10 @@
 {
   "versions": [
+    {
+      "git-tree": "9b4908a6183e914b33014a6b2f640df56e99d9f0",
+      "version-string": "2.1",
+      "port-version": 0
+    },
     {
       "git-tree": "6f5ac65e92858f04e97468de01d59b60c0eac058",
       "version-string": "2.0",