chore: update slack link, make perpetual (#271)

Signed-off-by: Jaime Silvela <[email protected]>

Author: jsilvela

content/releases/cloudnative-pg-1-25.1-released/index.md

@@ -62,7 +62,7 @@ carefully.
 
 We invite you to become an active member of our open-source, vendor-neutral
 community. Connect with us through our
-[Slack channel](https://join.slack.com/t/cloudnativepg/shared_invite/zt-30a6l6bp3-u1lNAmh~N02Cfiv2utKTFg)
+[Slack channel](https://join.slack.com/t/cloudnativepg/shared_invite/zt-32c83whjr-L4poobu8NEVGGXqF_Mu5VA)
 and stay informed about the latest developments by following us on
 [Twitter](https://twitter.com/CloudNativePg).
 

layouts/partials/nav.html

@@ -58,7 +58,7 @@
         <a class="github-button" href="https://github.com/cloudnative-pg/cloudnative-pg"
           data-color-scheme="no-preference: light; light: light; dark: dark;" data-size="large" data-show-count="true"
           aria-label="Star cloudnative-pg/cloudnative-pg on GitHub">Star</a>
-        <a href="https://join.slack.com/t/cloudnativepg/shared_invite/zt-30a6l6bp3-u1lNAmh~N02Cfiv2utKTFg">
+        <a href="https://join.slack.com/t/cloudnativepg/shared_invite/zt-32c83whjr-L4poobu8NEVGGXqF_Mu5VA">
           <img src="/icons/Slack.svg" alt="Slack" title="Join our Slack channel now!">
         </a>
         <a href="https://twitter.com/CloudNativePg">