[RELEASE] Released version 2.9-dev6

[RELEASE] Released version 2.9-dev6

Released version 2.9-dev6 with the following main changes :
    - BUG/MINOR: quic: fdtab array underflow access
    - DEBUG: pools: always record the caller for uncached allocs as well
    - DEBUG: pools: pass the caller pointer to the check functions and macros
    - DEBUG: pools: make pool_check_pattern() take a pointer to the pool
    - DEBUG: pools: inspect pools on fatal error and dump information found
    - BUG/MEDIUM: quic: quic_cc_conn ->cntrs counters unreachable
    - DEBUG: pools: also print the item's pointer when crashing
    - DEBUG: pools: also print the value of the tag when it doesn't match
    - DEBUG: pools: print the contents surrounding the expected tag location
    - MEDIUM: pools: refine pool size rounding
    - BUG/MEDIUM: hlua: don't pass stale nargs argument to lua_resume()
    - BUG/MINOR: hlua/init: coroutine may not resume itself
    - BUG/MEDIUM: mux-fcgi: Don't swap trash and dbuf when handling STDERR records
    - BUG/MINOR: promex: fix backend_agg_check_status
    - BUG/MEDIUM: master/cli: Pin the master CLI on the first thread of the group 1
    - MAJOR: import: update mt_list to support exponential back-off
    - CLEANUP: pools: simplify the pool expression when no pool was matched in dump
    - MINOR: samples: implement bytes_in and bytes_out samples
    - DOC: configuration: add %[req.ver] sample to %HV
    - BUG/MINOR: quic: Leak of frames to send.
    - DOC: configuration: add %[query] to %HQ
    - BUG/MINOR: freq_ctr: fix possible negative rate with the scaled API
    - BUG/MAJOR: mux-h2: Report a protocol error for any DATA frame before headers
    - BUILD: quic: fix build on centos 8 and USE_QUIC_OPENSSL_COMPAT
    - Revert "MAJOR: import: update mt_list to support exponential back-off"
    - BUG/MINOR: server: add missing free for server->rdr_pfx
    - REGTESTS: ssl: skip OCSP test w/ WolfSSL
    - REGTESTS: ssl: skip generate-certificates test w/ wolfSSL
    - MINOR: logs: clarify the check of the log range
    - MINOR: log: remove the unused curr_idx in struct smp_log_range
    - CLEANUP: logs: rename a confusing local variable "curr_rg" to "smp_rg"
    - MINOR: logs: use a single index to store the current range and index
    - MEDIUM: logs: atomically check and update the log sample index
    - CLEANUP: ring: rename the ring lock "RING_LOCK" instead of "LOGSRV_LOCK"
    - BUG/MEDIUM: http-ana: Try to handle response before handling server abort
    - MEDIUM: tools/ip: v4tov6() and v6tov4() rework
    - MINOR: pattern/ip: offload ip conversion logic to helper functions
    - MINOR: pattern: fix pat_{parse,match}_ip() function comments
    - MINOR: pattern/ip: simplify pat_match_ip() function
    - BUG/MEDIUM: server/cli: don't delete a dynamic server that has streams
    - MINOR: hlua: Add support for the "http-after-res" action
    - BUG/MINOR: proto_reverse_connect: fix preconnect with startup name resolution
    - MINOR: proto_reverse_connect: prevent transparent server for pre-connect
    - CI: cirrus-ci: display gdb bt if any
    - MEDIUM: sample: Enhances converter "bytes" to take variable names as arguments
    - MEDIUM: sample: Small fix in function check_operator for eror reporting
    - MINOR: quic: handle external extra CIDs generator.
    - BUG/MINOR: proto_reverse_connect: set default maxconn
    - MINOR: proto_reverse_connect: refactor preconnect failure
    - MINOR: proto_reverse_connect: remove unneeded wakeup
    - MINOR: proto_reverse_connect: emit log for preconnect