Bumps testing image to 8.2.1-pre #6868

Job	Run time
Code linters	16s
redis_version	3s
Dependency audit	24s
Install package from commit hash (3.12)	12s
Install package from commit hash (3.10)	12s
Install package from commit hash (3.11)	12s
Install package from commit hash (pypy-3.9)	20s
Install package from commit hash (3.9)	17s
Install package from commit hash (3.13)	11s
Install package from commit hash (pypy-3.10)	17s
Redis 8.0.2; Python 3.9; RESP Parser:plain; EL:asyncio	40m 27s
Redis 8.2.1-pre; Python 3.9; RESP Parser:plain; EL:asyncio	40m 0s
Redis 7.4.4; Python 3.13; RESP Parser:plain; EL:asyncio	19m 22s
Redis 8.2.1-pre; Python 3.13; RESP Parser:plain; EL:asyncio	25m 49s
Redis 7.4.4; Python 3.9; RESP Parser:plain; EL:asyncio	30m 10s
Redis 7.2.9; Python 3.13; RESP Parser:plain; EL:asyncio	15m 39s
Redis 8.0.2; Python 3.13; RESP Parser:plain; EL:asyncio	25m 1s
Redis 7.2.9; Python 3.9; RESP Parser:plain; EL:asyncio	25m 23s
Redis ${{ matrix.redis-version }}; Python ${{ matrix.python-version }}; RESP Parser:${{ matrix.parser-backend }}; EL:${{ matrix.event-loop }}	-1s
Redis ${{ matrix.redis-version }}; Python ${{ matrix.python-version }}; RESP Parser:${{ matrix.parser-backend }} (${{ matrix.hiredis-version }}); EL:${{ matrix.event-loop }}	-1s
Validate building and installing the package	-1s
Redis ${{ matrix.redis-version }}; Python ${{ matrix.python-version }}; RESP Parser:${{ matrix.parser-backend }}; EL:${{ matrix.event-loop }}	-1s
	3h 44m 11s

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