Bump Terraform cyrilgdn/postgresql provider version to 1.21.0 (#484)

<Actions>
<action
id="16c2f665ec8f38b263f8d1f01847791b753aaf4c15655cd80097752f2ecae989">
        <h3>Bump Terraform `postgresql` provider version</h3>
<details
id="1d9343c012f5434ac9fe8a98135bae3667b399259be16d9b14302ea3bd424a24">
            <summary>Update Terraform lock file</summary>
<p>&#34;cyrilgdn/postgresql&#34; updated from &#34;1.21.0&#34; to
&#34;1.21.0&#34; in file &#34;.terraform.lock.hcl&#34;</p>
            <details>
                <summary>1.21.0</summary>
<pre>Changelog retrieved
from:&#xA;&#x9;https://github.com/cyrilgdn/terraform-provider-postgresql/releases/tag/v1.21.0&#xA;##
What&#39;s Changed&#xD;&#xA;* Make function security, strictness,
volatility, and parallel safety configurable by @tommyzli in
https://github.com/cyrilgdn/terraform-provider-postgresql/pull/307&#xD;&#xA;*
postgresql_publication.markdown - table ordering by @RoseateSpoonbill in
https://github.com/cyrilgdn/terraform-provider-postgresql/pull/265&#xD;&#xA;*
Bump gocloud dependency to fix aws CA validation by @toadjaune in
https://github.com/cyrilgdn/terraform-provider-postgresql/pull/340&#xD;&#xA;*
feat: Allow for inlining client cert by @vr in
https://github.com/cyrilgdn/terraform-provider-postgresql/pull/342&#xD;&#xA;*
Update postgresql_extension.html.markdown by @tspearconquest in
https://github.com/cyrilgdn/terraform-provider-postgresql/pull/337&#xD;&#xA;*
Use uint32 for OID to stop conversion errors with pguint32 by @mat285 in
https://github.com/cyrilgdn/terraform-provider-postgresql/pull/324&#xD;&#xA;*
feat: Postgresql 15 support by @cyrilgdn in
https://github.com/cyrilgdn/terraform-provider-postgresql/pull/348&#xD;&#xA;*
Added MS Azure passwordless authentication by @librucha in
https://github.com/cyrilgdn/terraform-provider-postgresql/pull/346&#xD;&#xA;*
Add &#39;Injecting credentials&#39; section to provider docs by @rdarcy1
in
https://github.com/cyrilgdn/terraform-provider-postgresql/pull/318&#xD;&#xA;*
fixed escaping for postgresql user info by @librucha in
https://github.com/cyrilgdn/terraform-provider-postgresql/pull/344&#xD;&#xA;&#xD;&#xA;##
New Contributors&#xD;&#xA;* @tommyzli made their first contribution in
https://github.com/cyrilgdn/terraform-provider-postgresql/pull/307&#xD;&#xA;*
@RoseateSpoonbill made their first contribution in
https://github.com/cyrilgdn/terraform-provider-postgresql/pull/265&#xD;&#xA;*
@toadjaune made their first contribution in
https://github.com/cyrilgdn/terraform-provider-postgresql/pull/340&#xD;&#xA;*
@vr made their first contribution in
https://github.com/cyrilgdn/terraform-provider-postgresql/pull/342&#xD;&#xA;*
@tspearconquest made their first contribution in
https://github.com/cyrilgdn/terraform-provider-postgresql/pull/337&#xD;&#xA;*
@mat285 made their first contribution in
https://github.com/cyrilgdn/terraform-provider-postgresql/pull/324&#xD;&#xA;*
@librucha made their first contribution in
https://github.com/cyrilgdn/terraform-provider-postgresql/pull/346&#xD;&#xA;*
@rdarcy1 made their first contribution in
https://github.com/cyrilgdn/terraform-provider-postgresql/pull/318&#xD;&#xA;&#xD;&#xA;**Full
Changelog**:
https://github.com/cyrilgdn/terraform-provider-postgresql/compare/v1.20.0...v1.21.0</pre>
            </details>
        </details>
    </action>
</Actions>

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