[Website] Add ADBC 0.5.1 release post (#378)

Author: lidavidm

_posts/2023-06-27-adbc-0.5.1-release.md

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+---
+layout: post
+title: "Apache Arrow ADBC 0.5.1 (Libraries) Release"
+date: "2023-06-27 00:00:00"
+author: pmc
+categories: [release]
+---
+<!--
+{% comment %}
+Licensed to the Apache Software Foundation (ASF) under one or more
+contributor license agreements.  See the NOTICE file distributed with
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+(the "License"); you may not use this file except in compliance with
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+
+http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
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+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+{% endcomment %}
+-->
+
+The Apache Arrow team is pleased to announce the 0.5.1 release of
+the Apache Arrow ADBC libraries. This covers includes [**8
+resolved issues**][1] from [**8 distinct contributors**][2].
+
+This is a release of the **libraries**, which are at version
+0.5.1.  The **API specification** is versioned separately and is
+at version 1.0.0.
+
+The release notes below are not exhaustive and only expose selected
+highlights of the release. Many other bugfixes and improvements have
+been made: we refer you to the [complete changelog][3].
+
+## Release Highlights
+
+This is a patch release primarily aimed at fixing a [deadlock in the Snowflake driver][6] that was discovered post-release.
+
+## Contributors
+
+```
+$ git shortlog --perl-regexp --author='^((?!dependabot\[bot\]).*)$' -sn apache-arrow-adbc-0.5.0..apache-arrow-adbc-0.5.1
+     9	David Li
+     5	Dewey Dunnington
+     4	Matt Topol
+     3	William Ayd
+     2	davidhcoe
+     1	Curt Hagenlocher
+     1	Diego Fernández Giraldo
+     1	Sutou Kouhei
+```
+
+## Roadmap
+
+Work for the proposed [1.1.0 API revision][adbc-api-1.1.0] is progressing on a [branch][adbc-api-1.1.0-branch], with several API proposals merged in and others awaiting review.  They will then receive prototype implementations before being submitted for review/voting.  This is not currently targeting any release of the ADBC libraries, although we hope to wrap up this effort in the next few months.
+
+A milestone has been created to explore [asynchronous APIs][adbc-api-1.2.0], which have been requested for a while now.
+
+## Getting Involved
+
+We welcome questions and contributions from all interested.  Issues
+can be filed on [GitHub][4], and questions can be directed to GitHub
+or the [Arrow mailing lists][5].
+
+[1]: https://github.com/apache/arrow-adbc/milestone/7
+[2]: #contributors
+[3]: https://github.com/apache/arrow-adbc/blob/apache-arrow-adbc-0.5.1/CHANGELOG.md
+[4]: https://github.com/apache/arrow-adbc/issues
+[5]: {% link community.md %}
+[6]: https://github.com/apache/arrow-adbc/commit/f35485a5f3c9597668c0b4a8936621c97c4adc15
+[adbc-api-1.1.0]: https://github.com/apache/arrow-adbc/milestone/3
+[adbc-api-1.1.0-branch]: https://github.com/apache/arrow-adbc/tree/spec-1.1.0
+[adbc-api-1.2.0]: https://github.com/apache/arrow-adbc/milestone/9