PHOENIX-7104 Remove phoenix 4.x info from Connectors BUILDING.md

[stoty]

No description provided.

[richardantal]

LGTM

[stoty]

💔 -1 overall

Vote	Subsystem	Runtime	Comment
+0 🆗	reexec	2m 25s	Docker mode activated.
		_ Prechecks _
+1 💚	dupname	0m 0s	No case conflicting files found.
+1 💚	@author	0m 0s	The patch does not contain any @author tags.
		_ master Compile Tests _
		_ Patch Compile Tests _
-1 ❌	markdownlint	0m 0s	The patch generated 2 new + 15 unchanged - 14 fixed = 17 total (was 29)
+1 💚	whitespace	0m 0s	The patch has no whitespace issues.
		_ Other Tests _
+1 💚	asflicense	0m 16s	The patch does not generate ASF License warnings.
		3m 2s

Subsystem	Report/Notes
Docker	ClientAPI=1.43 ServerAPI=1.43 base: https://ci-hadoop.apache.org/job/Phoenix/job/Phoenix-Connectors-PreCommit-GitHub-PR/job/PR-112/1/artifact/yetus-general-check/output/Dockerfile
GITHUB PR	#112
Optional Tests	dupname asflicense markdownlint
uname	Linux f5ba90f8c755 4.15.0-213-generic #224-Ubuntu SMP Mon Jun 19 13:30:12 UTC 2023 x86_64 x86_64 x86_64 GNU/Linux
Build tool	maven
Personality	dev/phoenix-connectors-personality.sh
git revision	master / a465c90
markdownlint	https://ci-hadoop.apache.org/job/Phoenix/job/Phoenix-Connectors-PreCommit-GitHub-PR/job/PR-112/1/artifact/yetus-general-check/output/diff-patch-markdownlint.txt
Max. process+thread count	52 (vs. ulimit of 30000)
modules	C: . U: .
Console output	https://ci-hadoop.apache.org/job/Phoenix/job/Phoenix-Connectors-PreCommit-GitHub-PR/job/PR-112/1/console
versions	git=2.7.4 maven=3.3.9 markdownlint=0.22.0
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