package/privoxy: security bump to version 3.0.29

package/privoxy: security bump to version 3.0.29

From the release notes:

- Security/Reliability:
  - Fixed memory leaks when a response is buffered and the buffer
    limit is reached or Privoxy is running out of memory.
    Commits bbd53f1010b and 4490d451f9b. OVE-20201118-0001.
    Sponsored by: Robert Klemme
  - Fixed a memory leak in the show-status CGI handler when
    no action files are configured. Commit c62254a686.
    OVE-20201118-0002.
    Sponsored by: Robert Klemme
  - Fixed a memory leak in the show-status CGI handler when
    no filter files are configured. Commit 1b1370f7a8a.
    OVE-20201118-0003.
    Sponsored by: Robert Klemme
  - Fixes a memory leak when client tags are active.
    Commit 245e1cf32. OVE-20201118-0004.
    Sponsored by: Robert Klemme
  - Fixed a memory leak if multiple filters are executed
    and the last one is skipped due to a pcre error.
    Commit 5cfb7bc8fe. OVE-20201118-0005.
  - Prevent an unlikely dereference of a NULL-pointer that
    could result in a crash if accept-intercepted-requests
    was enabled, Privoxy failed to get the request destination
    from the Host header and a memory allocation failed.
    Commit 7530132349. CID 267165. OVE-20201118-0006.
  - Fixed memory leaks in the client-tags CGI handler when
    client tags are configured and memory allocations fail.
    Commit cf5640eb2a. CID 267168. OVE-20201118-0007.
  - Fixed memory leaks in the show-status CGI handler when memory
    allocations fail. Commit 064eac5fd0 and commit fdee85c0bf3.
    CID 305233. OVE-20201118-0008.

For more details, see the announcement:
https://www.openwall.com/lists/oss-security/2020/11/29/1

Signed-off-by: Peter Korsgaard <peter@korsgaard.com>