man: Update the bug URL to gitlab.freedesktop.org

Point users to the GitLab issue tracker instead of Bugzilla, which is no
longer used.
Signed-off-by: Jeremy Cline <jcline@redhat.com>

man/drm-kms.xml

@@ -309,8 +309,7 @@ static int modeset_find_crtc(int fd, drmModeRes *res, drmModeConnector *conn)
   <refsect1>
     <title>Reporting Bugs</title>
     <para>Bugs in this manual should be reported to
-      https://bugs.freedesktop.org/enter_bug.cgi?product=DRI&amp;component=libdrm
-      under the "DRI" product, component "libdrm"</para>
+      https://gitlab.freedesktop.org/mesa/drm/-/issues</para>
   </refsect1>
 
   <refsect1>

man/drm-memory.xml

@@ -410,8 +410,7 @@ memset(map, 0, creq.size);
   <refsect1>
     <title>Reporting Bugs</title>
     <para>Bugs in this manual should be reported to
-      https://bugs.freedesktop.org/enter_bug.cgi?product=DRI&amp;component=libdrm
-      under the "DRI" product, component "libdrm"</para>
+      https://gitlab.freedesktop.org/mesa/drm/-/issues</para>
   </refsect1>
 
   <refsect1>

man/drm.xml

@@ -119,8 +119,7 @@
   <refsect1>
     <title>Reporting Bugs</title>
     <para>Bugs in this manual should be reported to
-      https://bugs.freedesktop.org/enter_bug.cgi?product=DRI&amp;component=libdrm
-      under the "DRI" product, component "libdrm"</para>
+      https://gitlab.freedesktop.org/mesa/drm/-/issues</para>
   </refsect1>
 
   <refsect1>

man/drmAvailable.xml

@@ -61,8 +61,7 @@
   <refsect1>
     <title>Reporting Bugs</title>
     <para>Bugs in this function should be reported to
-      https://bugs.freedesktop.org/enter_bug.cgi?product=DRI&amp;component=libdrm
-      under the "DRI" product, component "libdrm"</para>
+      https://gitlab.freedesktop.org/mesa/drm/-/issues</para>
   </refsect1>
 
   <refsect1>

man/drmHandleEvent.xml

@@ -86,8 +86,7 @@ typedef struct _drmEventContext {
   <refsect1>
     <title>Reporting Bugs</title>
     <para>Bugs in this function should be reported to
-      https://bugs.freedesktop.org/enter_bug.cgi?product=DRI&amp;component=libdrm
-      under the "DRI" product, component "libdrm"</para>
+      https://gitlab.freedesktop.org/mesa/drm/-/issues</para>
   </refsect1>
 
   <refsect1>

man/drmModeGetResources.xml

@@ -116,8 +116,7 @@ typedef struct _drmModeRes {
   <refsect1>
     <title>Reporting Bugs</title>
     <para>Bugs in this function should be reported to
-      https://bugs.freedesktop.org/enter_bug.cgi?product=DRI&amp;component=libdrm
-      under the "DRI" product, component "libdrm"</para>
+      https://gitlab.freedesktop.org/mesa/drm/-/issues</para>
   </refsect1>
 
   <refsect1>